Author:
Subject: Processors
Manufacturer: AMD

EPYC makes its move into the data center

Because we traditionally focus and feed on the excitement and build up surrounding consumer products, the AMD Ryzen 7 and Ryzen 5 launches were huge for us and our community. Finally seeing competition to Intel’s hold on the consumer market was welcome and necessary to move the industry forward, and we are already seeing the results of some of that with this week’s Core i9 release and pricing. AMD is, and deserves to be, proud of these accomplishments. But from a business standpoint, the impact of Ryzen on the bottom line will likely pale in comparison to how EPYC could fundamentally change the financial stability of AMD.

AMD EPYC is the server processor that takes aim at the Intel Xeon and its dominant status on the data center market. The enterprise field is a high margin, high profit area and while AMD once had significant share in this space with Opteron, that has essentially dropped to zero over the last 6+ years. AMD hopes to use the same tactic in the data center as they did on the consumer side to shock and awe the industry into taking notice; AMD is providing impressive new performance levels while undercutting the competition on pricing.

Introducing the AMD EPYC 7000 Series

Targeting the single and 2-socket systems that make up ~95% of the market for data centers and enterprise, AMD EPYC is smartly not trying to swing over its weight class. This offers an enormous opportunity for AMD to take market share from Intel with minimal risk.

epyc-13.jpg

Many of the specifications here have been slowly shared by AMD over time, including at the recent financial analyst day, but seeing it placed on a single slide like this puts everything in perspective. In a single socket design, servers will be able to integrate 32 cores with 64 threads, 8x DDR4 memory channels with up to 2TB of memory capacity per CPU, 128 PCI Express 3.0 lanes for connectivity, and more.

Worth noting on this slide, and was originally announced at the financial analyst day as well, is AMD’s intent to maintain socket compatibility going forward for the next two generations. Both Rome and Milan, based on 7nm technology, will be drop-in upgrades for customers buying into EPYC platforms today. That kind of commitment from AMD is crucial to regain the trust of a market that needs those reassurances.

epyc-14.jpg

Here is the lineup as AMD is providing it for us today. The model numbers in the 7000 series use the second and third characters as a performance indicator (755x will be faster than 750x, for example) and the fourth character to indicate the generation of EPYC (here, the 1 indicates first gen). AMD has created four different core count divisions along with a few TDP options to help provide options for all types of potential customers. It is worth noting that though this table might seem a bit intimidating, it is drastically more efficient when compared to the Intel Xeon product line that exists today, or that will exist in the future.  AMD is offering immediate availability of the top five CPUs in this stack, with the bottom four due before the end of July.

Continue reading about the AMD EPYC data center processor!

Author:
Manufacturer: AMD

We are up to two...

UPDATE (5/31/2017): Crystal Dynamics was able to get back to us with a couple of points on the changes that were made with this patch to affect the performance of AMD Ryzen processors.

  1. Rise of the Tomb Raider splits rendering tasks to run on different threads. By tuning the size of those tasks – breaking some up, allowing multicore CPUs to contribute in more cases, and combining some others, to reduce overheads in the scheduler – the game can more efficiently exploit extra threads on the host CPU.
     
  2. An optimization was identified in texture management that improves the combination of AMD CPU and NVIDIA GPU.  Overhead was reduced by packing texture descriptor uploads into larger chunks.

There you have it, a bit more detail on the software changes made to help adapt the game engine to AMD's Ryzen architecture. Not only that, but it does confirm our information that there was slightly MORE to address in the Ryzen+GeForce combinations.

END UPDATE

Despite a couple of growing pains out of the gate, the Ryzen processor launch appears to have been a success for AMD. Both the Ryzen 7 and the Ryzen 5 releases proved to be very competitive with Intel’s dominant CPUs in the market and took significant leads in areas of massive multi-threading and performance per dollar. An area that AMD has struggled in though has been 1080p gaming – performance in those instances on both Ryzen 7 and 5 processors fell behind comparable Intel parts by (sometimes) significant margins.

Our team continues to watch the story to see how AMD and game developers work through the issue. Most recently I posted a look at the memory latency differences between Ryzen and Intel Core processors. As it turns out, the memory latency differences are a significant part of the initial problem for AMD:

Because of this, I think it is fair to claim that some, if not most, of the 1080p gaming performance deficits we have seen with AMD Ryzen processors are a result of this particular memory system intricacy. You can combine memory latency with the thread-to-thread communication issue we discussed previously into one overall system level complication: the Zen memory system behaves differently than anything we have seen prior and it currently suffers in a couple of specific areas because of it.

In that story I detailed our coverage of the Ryzen processor and its gaming performance succinctly:

Our team has done quite a bit of research and testing on this topic. This included a detailed look at the first asserted reason for the performance gap, the Windows 10 scheduler. Our summary there was that the scheduler was working as expected and that minimal difference was seen when moving between different power modes. We also talked directly with AMD to find out its then current stance on the results, backing up our claims on the scheduler and presented a better outlook for gaming going forward. When AMD wanted to test a new custom Windows 10 power profile to help improve performance in some cases, we took part in that too. In late March we saw the first gaming performance update occur courtesy of Ashes of the Singularity: Escalation where an engine update to utilize more threads resulted in as much as 31% average frame increase.

Quick on the heels of the Ryzen 7 release, AMD worked with the developer Oxide on the Ashes of the Singularity: Escalation engine. Through tweaks and optimizations, the game was able to showcase as much as a 30% increase in average frame rate on the integrated benchmark. While this was only a single use case, it does prove that through work with the developers, AMD has the ability to improve the 1080p gaming positioning of Ryzen against Intel.

rotr-screen4-small.jpg

Fast forward to today and I was surprised to find a new patch for Rise of the Tomb Raider, a game that was actually one of the worst case scenarios for AMD with Ryzen. (Patch #12, v1.0.770.1) The patch notes mention the following:

The following changes are included in this patch

- Fix certain DX12 crashes reported by users on the forums.

- Improve DX12 performance across a variety of hardware, in CPU bound situations. Especially performance on AMD Ryzen CPUs can be significantly improved.

While we expect this patch to be an improvement for everyone, if you do have trouble with this patch and prefer to stay on the old version we made a Beta available on Steam, build 767.2, which can be used to switch back to the previous version.

We will keep monitoring for feedback and will release further patches as it seems required. We always welcome your feedback!

Obviously the data point that stood out for me was the improved DX12 performance “in CPU bound situations. Especially on AMD Ryzen CPUs…”

Remember how the situation appeared in April?

rotr.png

The Ryzen 7 1800X was 24% slower than the Intel Core i7-7700K – a dramatic difference for a processor that should only have been ~8-10% slower in single threaded workloads.

How does this new patch to RoTR affect performance? We tested it on the same Ryzen 7 1800X benchmarks platform from previous testing including the ASUS Crosshair VI Hero motherboard, 16GB DDR4-2400 memory and GeForce GTX 1080 Founders Edition using the 378.78 driver. All testing was done under the DX12 code path.

tr-1.png

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The Ryzen 7 1800X score jumps from 107 FPS to 126.44 FPS, an increase of 17%! That is a significant boost in performance at 1080p while still running at the Very High image quality preset, indicating that the developer (and likely AMD) were able to find substantial inefficiencies in the engine. For comparison, the 8-core / 16-thread Intel Core i7-6900K only sees a 2.4% increase from this new game revision. This tells us that the changes to the game were specific to Ryzen processors and their design, but that no performance was redacted from the Intel platforms.

Continue reading our look at the new Rise of the Tomb Raider patch for Ryzen!

AMD Teases Ryzen Mobile APUs with Zen CPU Cores and On-Die Vega Graphics

Subject: Processors | May 18, 2017 - 01:01 AM |
Tagged: Zen, Vega, ryzen mobile, ryzen, raven ridge, APU, amd

AMD teased its upcoming Zen-based APUs aimed at mobile devices during its Financial Analyst Day where the company revealed the "Raven Ridge" parts will be aptly known as Ryzen Mobile. The Tech Report managed to acquire a couple slides which confirm some of the broader specifications and reveal how they stack up to AMD's latest Bristol Ridge A-Series APUs – at least as far as AMD's internal testing is concerned (which is to say not independently verified yet so take with a grain of salt).

AMD Ryzen Mobile APUs.jpg

Ryzen Mobile appears to be the new consumer-facing brand name for what has so far been code named "Raven Ridge". These parts will use a Zen-based CPU, Vega GPU, and integrated chipset. Thanks to the slides, it is now confirmed that the Vega-based graphics processor will be on-die. What has not been confirmed is whether the chipset will be on die or on package and exact specifications on CPU cores counts, GPU Compute Units, cache, memory support, and I/O like PCI-E lanes (you know, all the good stuff! heh). Note that rumors so far point towards Raven Ridge / Ryzen Mobile utilizing a single 4-core (8-thread) CCX, per core L2, 8MB shared L3 cache, and a Vega-based GPU with 1024 cores. HBM2 has also been rumored for awhile but we will have to wait for more leaks and/or an official announcement to know for sure if these Ryzen Mobile parts aimed for the second half of 2017 will have that (hopefully!).

With that said, according to AMD, Ryzen Mobile will offer up to 50% better CPU performance, 40% better GPU performance, and will use up to 50% less power than the previous 7th generation (Excavator-based) A-Series APUs (e.g. FX 9830P and A12-9730P). Those are some pretty bold claims, but still within the realm of possibility. Zen and Vega are both much more efficient architectures and AMD is also benefiting from a smaller process node (TSMC 28nm vs Samsung / GlobalFoundries 14nm FinFET). I do wonder how high the APUs will be able to clock on the CPU side of things with 4 GHz seeming to be the wall for most Zen-based Summit Ridge chips, so most of the CPU performance improvement claims will have to come from architecture changes rather than increases in clockspeeds (the highest clocked A-Series Bristol Ridge ran at up to 3.7 GHz and I would expect Raven Ridge to be around that, maybe the flagship part turbo-ing a bit more). Raven Ridge will benefit from the shared L3 cache and, more importantly, twice as many threads (4 vs 8) and this may be where AMD is primarily getting that 50% more CPU performance number from. On the graphics side of things, it looks like Bristol Ridge with its R7 graphics (GCN 3 (Tonga/Fiji on the Desktop)) had up to 512 cores. Again, taking the rumors into account which say that Raven Ridge will have a 1024 core Vega GPU, this may be where AMD is getting the large performance increase from (the core increase as well as newer architecture). On the other hand, the 40% number could suggest Ryzen Mobile will not have twice the GPU cores. I would guess that 1024 might be possible, but running at lower clocks and that is where the discrepancy is. I will admit I am a bit skeptical about the 1024 (16 CU) number though because that is a huge jump... I guess we will see though!

Further, I am curious if Ryzen Mobile will use HBC (high bandwidth cache) and if HBM2 does turn out to be utilized how that will play into the HBC and whether or not we will finally see the fruits of AMD's HSA labors! I think we will see most systems use DDR4, but certainly some SKUs could use HBM2 and that would definitely open up a lot of performance possibilities on mobile!

There is still a lot that we do not know, but Ryzen Mobile is coming and AMD is making big promises that I hope it delivers on. The company is aiming the new chips at a wide swath of the mobile market from budget laptops and tablets to convertibles and even has their sights set on premium thin and lights. The mobile space is one where AMD has struggled with in getting design wins even when they had good parts for that type of system. They will really need to push and hit Ryzen Mobile out of the park to make inroads into the laptop, tablet, and ultrabook markets!

AMD plans to launch the consumer version of Ryzen Mobile in the second half of this year (presumably with systems featuring the new APUs out in time for the holidays if not for the back to school end of summer rush). The commercial SKUs (which I think refers to the Ryzen equivalent of AMD Pro series APUs.Update: Mobile Ryzen Pro) will follow in the first half of 2018.

What are your thoughts on Ryzen Mobile and the alleged performance and power characteristics? Do you think the rumors are looking more or less correct?

Also read:

Source: Tech Report

AMD's 16-Core Ryzen Threadripper CPUs Coming This Summer

Subject: Processors | May 16, 2017 - 07:22 PM |
Tagged: Zen, Threadripper, ryzen, processor, HEDT, cpu, amd

AMD revealed their entry into high-end desktop (HEDT) with the upcoming Ryzen "Threadripper" CPUs, which will feature up to 16 cores and 32 threads.

Threadripper 2.png

Little information was revealed along with the announcement, other than to announce availablility as "summer 2017", though rumors and leaks surrounding Threadripper have been seen on the internet (naturally) leading up to today's announcement, including this one from Wccftech. Not only will Threadripper (allegedly) offer quad-channel memory support and 44 PCI Express lanes, but they are also rumored to be released in a massive 4094-pin package (same as "Naples" aka EPYC) that most assuredly will not fit into the AM4 socket.

WCCFTECH Chart 2.png

Image credit: Wccftech

These Threadripper CPUs follow the lead of Intel's HEDT parts on X99, which are essentially re-appropriated Xeons with higher clock speeds and some feature differences such as a lack of ECC memory support. It remains to be seen what exactly will separate the enthusiast AMD platform from the EPYC datacenter platform, though the rumored base clock speeds are much higher with Threadripper.

Source: AMD

AMD Announces EPYC: A Massive 32-Core Datacenter SoC

Subject: Processors | May 16, 2017 - 06:49 PM |
Tagged: Zen, server, ryzen, processor, EPYC, datacenter, cpu, amd, 64 thread, 32 core

AMD has announced their new datacenter CPU built on the Zen architecture, which the company is calling EPYC. And epic they are, as these server processors will be offered with up to 32 cores and 64 threads, 8 memory channels, and 128 PCI Express lanes per CPU.

Epyc_1.jpg

Some of the details about the upcoming "Naples" server processors (now EPYC) were revealed by AMD back in March, when the upcoming server chips were previewed:

"Naples" features:

  • A highly scalable, 32-core System on Chip (SoC) design, with support for two high-performance threads per core
  • Industry-leading memory bandwidth, with 8-channels of memory per "Naples" device. In a 2-socket server, support for up to 32 DIMMS of DDR4 on 16 memory channels, delivering up to 4 terabytes of total memory capacity.
  • The processor is a complete SoC with fully integrated, high-speed I/O supporting 128 lanes of PCIe, negating the need for a separate chip-set
  • A highly-optimized cache structure for high-performance, energy efficient compute
  • AMD Infinity Fabric coherent interconnect for two "Naples" CPUs in a 2-socket system
  • Dedicated security hardware 

EPYC Screen.png

Compared to Ryzen (or should it be RYZEN?), EPYC offers a huge jump in core count and available performance - though AMD's other CPU announcement (Threadripper) bridges the gap between the desktop and datacenter offerings with an HEDT product. This also serves to bring AMD's CPU offerings to parity with the Intel product stack with desktop/high performance desktop/server CPUs.

epycpackage.jpg

EPYC is a large processor. (Image credit: The Tech Report)

While specifications were not offered, there have been leaks (of course) to help fill in the blanks. Wccftech offers these specs for EPYC (on the left):

Wccftech Chart.png

(Image credit: Wccftech)

We await further information from AMD about the EPYC launch.

Source: AMD
Author:
Subject: Processors
Manufacturer: AMD

Tweaks for days

It seems like it’s been months since AMD launched Ryzen, its first new processor architecture in about a decade, when in fact we are only four weeks removed. One of the few concerns about the Ryzen processors centered on its performance in some gaming performance results, particularly in common resolutions like 1080p. While I was far from the only person to notice these concerns, our gaming tests clearly showed a gap between the Ryzen 7 1800X and the Intel Core i7-7700K and 6900K processors in Civilization 6, Hitman and Rise of the Tomb Raider.

hitman.png

A graph from our Ryzen launch coverage...

We had been working with AMD for a couple of weeks on the Ryzen launch and fed back our results with questions in the week before launch. On March 2nd, AMD’s CVP of Marketing John Taylor gave us a prepared statement that acknowledged the issue but promised changes come in form for game engine updates. These software updates would need to be implemented by the game developers themselves in order to take advantage of the unique and more complex core designs of the Zen architecture. We had quotes from the developers of Ashes of the Singularity as well as the Total War series to back it up.

And while statements promising change are nice, it really takes some proof to get the often skeptical tech media and tech enthusiasts to believe that change can actually happen. Today AMD is showing its first result.

The result of 400 developer hours of work, the Nitrous Engine powering Ashes of the Singularity received an update today to version 26118 that integrates updates to threading to better balance the performance across Ryzen 7’s 8 cores and 16 threads. I was able to do some early testing on the new revision, as well as with the previous retail shipping version (25624) to see what kind of improvements the patch brings with it.

Stardock / Oxide CEO Brad Wardell had this to say in a press release:

“I’ve always been vocal about taking advantage of every ounce of performance the PC has to offer. That’s why I’m a strong proponent of DirectX 12 and Vulkan® because of the way these APIs allow us to access multiple CPU cores, and that’s why the AMD Ryzen processor has so much potential,” said Stardock and Oxide CEO Brad Wardell. “As good as AMD Ryzen is right now – and it’s remarkably fast – we’ve already seen that we can tweak games like Ashes of the Singularity to take even more advantage of its impressive core count and processing power. AMD Ryzen brings resources to the table that will change what people will come to expect from a PC gaming experience.”

Our testing setup is in line with our previous CPU performance stories.

Test System Setup
CPU AMD Ryzen 7 1800X
Intel Core i7-6900K
Motherboard ASUS Crosshair VI Hero (Ryzen)
ASUS X99-Deluxe II (Broadwell-E)
Memory 16GB DDR4-2400
Storage Corsair Force GS 240 SSD
Sound Card On-board
Graphics Card NVIDIA GeForce GTX 1080 8GB
Graphics Drivers NVIDIA 378.49
Power Supply Corsair HX1000
Operating System Windows 10 Pro x64

I was using the latest BIOS for our ASUS Crosshair VI Hero motherboard (1002) and upgraded to some Geil RGB (!!) memory capable of running at 3200 MHz on this board with a single BIOS setting adjustment. All of my tests were done at 1080p in order to return to the pain point that AMD was dealing with on launch day.

Let’s see the results.

ashes-1.png

ashes-2.png

These are substantial performance improvements with the new engine code! At both 2400 MHz and 3200 MHz memory speeds, and at both High and Extreme presets in the game (all running in DX12 for what that’s worth), the gaming performance on the GPU-centric is improved. At the High preset (which is the setting that AMD used in its performance data for the press release), we see a 31% jump in performance when running at the higher memory speed and a 22% improvement with the lower speed memory. Even when running at the more GPU-bottlenecked state of the Extreme preset, that performance improvement for the Ryzen processors with the latest Ashes patch is 17-20%!

DSC02636.jpg

It’s also important to note that Intel performance is unaffected – either for the better or worse. Whatever work Oxide did to improve the engine for AMD’s Ryzen processors had NO impact on the Core processors, which is interesting to say the least. The cynic in me would believe there is little chance that any agnostic changes to code would raise Intel’s multi-core performance at least a little bit.

So what exactly is happening to the engine with v26118? I haven’t had a chance to have an in-depth conversation with anyone at AMD or Oxide yet on the subject, but at a high level, I was told that this is what happens when instructions and sequences are analyzed for an architecture specifically. “For basically 5 years”, I was told, Oxide and other developers have dedicated their time to “instruction traces and analysis to maximize Intel performance” which helps to eliminate poor instruction setup. After spending some time with Ryzen and the necessary debug tools (and some AMD engineers), they were able to improve performance on Ryzen without adversely affecting Intel parts.

ping-amd.png

Core to core latency testing on Ryzen 7 1800X

I am hoping to get more specific detail in the coming days, but it would seem very likely that Oxide was able to properly handle the more complex core to core communication systems on Ryzen and its CCX implementation. We demonstrated early this month how thread to thread communication across core complexes causes substantially latency penalties, and that a developer that intelligently manages threads that have dependencies on the core complex can improve overall performance. I would expect this is at least part of the solution Oxide was able to integrate (and would also explain why Intel parts are unaffected).

What is important now is that AMD takes this momentum with Ashes of the Singularity and actually does something with it. Many of you will recognize Ashes as the flagship title for Mantle when AMD made that move to change the programming habits and models for developers, and though Mantle would eventually become Vulkan and drive DX12 development, it did not foretell an overall shift as it hoped to. Can AMD and its developer relations team continue to make the case that spending time and money (which is what 400 developer hours equates to) to make specific performance enhancements for Ryzen processors is in the best interest of everyone? We’ll soon find out.

Author:
Subject: Processors
Manufacturer: AMD

The right angle

While many in the media and enthusiast communities are still trying to fully grasp the importance and impact of the recent AMD Ryzen 7 processor release, I have been trying to complete my review of the 1700X and 1700 processors, in between testing the upcoming GeForce GTX 1080 Ti and preparing for more hardware to show up at the offices very soon. There is still much to learn and understand about the first new architecture from AMD in nearly a decade, including analysis of the memory hierarchy, power consumption, overclocking, gaming performance, etc.

During my Ryzen 7 1700 testing, I went through some overclocking evaluation and thought the results might be worth sharing earlier than later. This quick article is just a preview of what we are working on so don’t expect to find the answers to Ryzen power management here, only a recounting of how I was able to get stellar performance from the lowest priced Ryzen part on the market today.

The system specifications for this overclocking test were identical to our original Ryzen 7 processor review.

Test System Setup
CPU AMD Ryzen 7 1800X
AMD Ryzen 7 1700X
AMD Ryzen 7 1700
Intel Core i7-7700K
Intel Core i5-7600K
Intel Core i7-6700K
Intel Core i7-6950X
Intel Core i7-6900K
Intel Core i7-6800K
Motherboard ASUS Crosshair VI Hero (Ryzen)
ASUS Prime Z270-A (Kaby Lake, Skylake)
ASUS X99-Deluxe II (Broadwell-E)
Memory 16GB DDR4-2400
Storage Corsair Force GS 240 SSD
Sound Card On-board
Graphics Card NVIDIA GeForce GTX 1080 8GB
Graphics Drivers NVIDIA 378.49
Power Supply Corsair HX1000
Operating System Windows 10 Pro x64

Of note is that I am still utilizing the Noctua U12S cooler that AMD provided for our initial testing – all of the overclocking and temperature reporting in this story is air cooled.

DSC02643.jpg

First, let’s start with the motherboard. All of this testing was done on the ASUS Crosshair VI Hero with the latest 5704 BIOS installed. As I began to discover the different overclocking capabilities (BCLK adjustment, multipliers, voltage) I came across one of the ASUS presets. These presets offer pre-defined collections of settings that ASUS feels will offer simple overclocking capabilities. An option for higher BCLK existed but the one that caught my eye was straight forward – 4.0 GHz.

asusbios.jpg

With the Ryzen 1700 installed, I thought I would give it a shot. Keep in mind that this processor has a base clock of 3.0 GHz, a rated maximum boost clock of 3.7 GHz, and is the only 65-watt TDP variant of the three Ryzen 7 processors released last week. Because of that, I didn’t expect the overclocking capability for it to match what the 1700X and 1800X could offer. Based on previous processor experience, when a chip is binned at a lower power draw than the rest of a family it will often have properties that make it disadvantageous for running at HIGHER power. Based on my results here, that doesn’t seem to the case.

4.0.PNG

By simply enabling that option in the ASUS UEFI and rebooting, our Ryzen 1700 processor was running at 4.0 GHz on all cores! For this piece, I won’t be going into the drudge and debate on what settings ASUS changed to get to this setting or if the voltages are overly aggressive – the point is that it just works out of the box.

Continue reading our look at overclocking the new Ryzen 7 1700 processor!

Ryzen shine! It is time for your AMD roundup

Subject: Processors | March 2, 2017 - 03:08 PM |
Tagged: Ryzen 1700X, Zen, x370, video, ryzen, amd

Having started your journey with Ryan's quick overview of the performance of the 1800X and anxiously awaiting our further coverage now that we have both the parts and the time to test them you might want to take a peek at some other coverage. [H]ard|OCP tested the processor which many may be looking at due to the more affordable pricing, the Ryzen 1700X.  Their test system is based on a Gigabyte A370-Gaming 5 with 16GB of Corsair Vengeance DDR4-3600 which ran at 2933MHz during testing; Kyle reached out to vendors who assured him an update will make 3GHz reachable will arrive soon.  Part of their testing focused on VR performance, so make sure to check out the full article.

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"Saying that we have waited for a long time for a "real" CPU out of AMD would be a gross misunderstatement, but today AMD looks to remedy that. We are now offered up a new CPU that carries the branding name of Ryzen. Has AMD risen from the CPU graveyard? You be the judge after looking at the data."

Here are some more Processor articles from around the web:

Processors

 

Source: [H]ard|OCP
Author:
Subject: Processors
Manufacturer: AMD

AMD Ryzen 7 Processor Specifications

It’s finally here and its finally time to talk about. The AMD Ryzen processor is being released onto the world and based on the buildup of excitement over the last week or so since pre-orders began, details on just how Ryzen performs relative to Intel’s mainstream and enthusiast processors are a hot commodity. While leaks have been surfacing for months and details seem to be streaming out from those not bound to the same restrictions we have been, I think you are going to find our analysis of the Ryzen 7 1800X processor to be quite interesting and maybe a little different as well.

Honestly, there isn’t much that has been left to the imagination about Ryzen, its chipsets, pricing, etc. with the slow trickle of information that AMD has been sending out since before CES in January. We know about the specifications, we know about the architecture, we know about the positioning; and while I will definitely recap most of that information here, the real focus is going to be on raw numbers. Benchmarks are what we are targeting with today’s story.

Let’s dive right in.

The Zen Architecture – Foundation for Ryzen

Actually, as it turns out, in typical Josh Walrath fashion, he wrote too much about the AMD Zen architecture to fit into this page. So, instead, you'll find his complete analysis of AMD's new baby right here: AMD Zen Architecture Overview: Focus on Ryzen

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AMD Ryzen 7 Processor Specifications

Though we have already detailed the most important specifications for the new AMD Ryzen processors when the preorders went live, its worth touching on them again and reemphasizing the important ones.

  Ryzen 7 1800X Ryzen 7 1700X Ryzen 7 1700 Core i7-6900K Core i7-6800K Core i7-7700K Core i5-7600K Core i7-6700K
Architecture Zen Zen Zen Broadwell-E Broadwell-E Kaby Lake Kaby Lake Skylake
Process Tech 14nm 14nm 14nm 14nm 14nm 14nm+ 14nm+ 14nm
Cores/Threads 8/16 8/16 8/16 8/16 6/12 4/8 4/4 4/8
Base Clock 3.6 GHz 3.4 GHz 3.0 GHz 3.2 GHz 3.4 GHz 4.2 GHz 3.8 GHz 4.0 GHz
Turbo/Boost Clock 4.0 GHz 3.8  GHz 3.7 GHz 3.7 GHz 3.6 GHz 4.5 GHz 4.2 GHz 4.2 GHz
Cache 20MB 20MB 20MB 20MB 15MB 8MB 8MB 8MB
Memory Support DDR4-2400
Dual Channel
DDR4-2400
Dual Channel
DDR4-2400
Dual Channel
DDR4-2400
Quad Channel
DDR4-2400
Quad Channel
DDR4-2400
Dual Channel
DDR4-2400
Dual Channel
DDR4-2400
Dual Channel
TDP 95 watts 95 watts 65 watts 140 watts 140 watts 91 watts 91 watts 91 watts
Price $499 $399 $329 $1050 $450 $350 $239 $309

All three of the currently announced Ryzen processors are 8-core, 16-thread designs, matching the Core i7-6900K from Intel in that regard. Though Intel does have a 10-core part branded for consumers, it comes in at a significantly higher price point (over $1500 still). The clock speeds of Ryzen are competitive with the Broadwell-E platform options though are clearly behind the curve when it comes the clock capabilities of Kaby Lake and Skylake. With admittedly lower IPC than Kaby Lake, Zen will struggle in any purely single threaded workload with as much as 500 MHz deficit in clock rate.

One interesting deviation from Intel's designs that Ryzen gets is a more granular boost capability. AMD Ryzen CPUs will be able move between processor states in 25 MHz increments while Intel is currently limited to 100 MHz. If implemented correctly and effectively through SenseMI, this allows Ryzen to get 25-75 MHz of additional performance in a scenario where it was too thermally constrainted to hit the next 100 MHz step. 

DSC02636.jpg

XFR (Extended Frequency Range), supported on the Ryzen 7 1800X and 1700X (hence the "X"), "lifts the maximum Precision Boost frequency beyond ordinary limits in the presence of premium systems and processor cooling." The story goes, that if you have better than average cooling, the 1800X will be able to scale up to 4.1 GHz in some instances for some undetermined amount of time. The better the cooling, the longer it can operate in XFR. While this was originally pitched to us as a game-changing feature that bring extreme advantages to water cooling enthusiasts, it seems it was scaled back for the initial release. Only getting 100 MHz performance increase, in the best case result, seems a bit more like technology for technology's sake rather than offering new capabilities for consumers.

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Ryzen integrates a dual channel DDR4 memory controller with speeds up to 2400 MHz, matching what Intel can do on Kaby Lake. Broadwell-E has the advantage with a quad-channel controller but how useful that ends of being will be interesting to see as we step through our performance testing.

One area of interest is the TDP ratings. AMD and Intel have very different views on how this is calculated. Intel has made this the maximum power draw of the processor while AMD sees it as a target for thermal dissipation over time. This means that under stock settings the Core i7-7700K will not draw more than 91 watts and the Core i7-6900K will not draw more than 140 watts. And in our testing, they are well under those ratings most of the time, whenever AVX code is not being operated. AMD’s 95-watt rating on the Ryzen 1800X though will very often be exceed, and our power testing proves that out. The logic is that a cooler with a 95-watt rating and the behavior of thermal propagation give the cooling system time to catch up. (Interestingly, this is the philosophy Intel has taken with its Kaby Lake mobile processors.)

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Obviously the most important line here for many of you is the price. The Core i7-6900K is the lowest priced 8C/16T option from Intel for consumers at $1050. The Ryzen R7 1800X has a sticker price less than half of that, at $499. The R7 1700X vs Core i7-6800K match is interesting as well, where the AMD CPU will sell for $399 versus $450 for the 6800K. However, the 6800K only has 6-cores and 12-threads, giving the Ryzen part an instead 25% boost in multi-threaded performance. The 7700K and R7 1700 battle will be interesting as well, with a 4-core difference in capability and a $30 price advantage to AMD.

Continue reading our review of the new AMD Ryzen 7 1800X processor!!

Author:
Subject: Processors
Manufacturer: AMD

What Makes Ryzen Tick

We have been exposed to details about the Zen architecture for the past several Hot Chips conventions as well as other points of information directly from AMD.  Zen was a clean sheet design that borrowed some of the best features from the Bulldozer and Jaguar architectures, as well as integrating many new ideas that had not been executed in AMD processors before.  The fusion of ideas from higher performance cores, lower power cores, and experience gained in APU/GPU design have all come together in a very impressive package that is the Ryzen CPU.

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It is well known that AMD brought back Jim Keller to head the CPU group after the slow downward spiral that AMD entered in CPU design.  While the Athlon 64 was a tremendous part for the time, the subsequent CPUs being offered by the company did not retain that leadership position.  The original Phenom had problems right off the bat and could not compete well with Intel’s latest dual and quad cores.  The Phenom II shored up their position a bit, but in the end could not keep pace with the products that Intel continued to introduce with their newly minted “tic-toc” cycle.  Bulldozer had issues  out of the gate and did not have performance numbers that were significantly greater than the previous generation “Thuban” 6 core Phenom II product, much less the latest Intel Sandy Bridge and Ivy Bridge products that it would compete with.

AMD attempted to stop the bleeding by iterating and evolving the Bulldozer architecture with Piledriver, Steamroller, and Excavator.  The final products based on this design arc seemed to do fine for the markets they were aimed at, but certainly did not regain any marketshare with AMD’s shrinking desktop numbers.  No matter what AMD did, the base architecture just could not overcome some of the basic properties that impeded strong IPC performance.

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The primary goal of this new architecture is to increase IPC to a level consistent to what Intel has to offer.  AMD aimed to increase IPC per clock by at least 40% over the previous Excavator core.  This is a pretty aggressive goal considering where AMD was with the Bulldozer architecture that was focused on good multi-threaded performance and high clock speeds.  AMD claims that it has in fact increased IPC by an impressive 54% from the previous Excavator based core.  Not only has AMD seemingly hit its performance goals, but it exceeded them.  AMD also plans on using the Zen architecture to power products from mobile products to the highest TDP parts offered.

 

The Zen Core

The basis for Ryzen are the CCX modules.  These modules contain four Zen cores along with 8 MB of shared L3 cache.  Each core has 64 KB of L1 I-cache and 32 KB of D-cache.  There is a total of 512 KB of L2 cache.  These caches are inclusive.  The L3 cache acts as a victim cache which partially copies what is in L1 and L2 caches.  AMD has improved the performance of their caches to a very large degree as compared to previous architectures.  The arrangement here allows the individual cores to quickly snoop any changes in the caches of the others for shared workloads.  So if a cache line is changed on one core, other cores requiring that data can quickly snoop into the shared L3 and read it.  Doing this allows the CPU doing the actual work to not be interrupted by cache read requests from other cores.

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Each core can handle two threads, but unlike Bulldozer has a single integer core.  Bulldozer modules featured two integer units and a shared FPU/SIMD.  Zen gets rid of CMT for good and we have a single integer and FPU units for each core.  The core can address two threads by utilizing AMD’s version of SMT (symmetric multi-threading).  There is a primary thread that gets higher priority while the second thread has to wait until resources are freed up.  This works far better in the real world than in how I explained it as resources are constantly being shuffled about and the primary thread will not monopolize all resources within the core.

Click here to read more about AMD's Zen architecture in Ryzen!