Author:
Manufacturer: NVIDIA

Battlefield 4 Results

At the end of my first Frame Rating evaluation of the GTX 970 after the discovery of the memory architecture issue, I proposed the idea that SLI testing would need to be done to come to a more concrete conclusion on the entire debate. It seems that our readers and the community at large agreed with us in this instance, repeatedly asking for those results in the comments of the story. After spending the better part of a full day running and re-running SLI results on a pair of GeForce GTX 970 and GTX 980 cards, we have the answers you're looking for.

Today's story is going to be short on details and long on data, so if you want the full back story on what is going on why we are taking a specific look at the GTX 970 in this capacity, read here:

Okay, are we good now? Let's dive into the first set of results in Battlefield 4.

Battlefield 4 Results

Just as I did with the first GTX 970 performance testing article, I tested Battlefield 4 at 3840x2160 (4K) and utilized the game's ability to linearly scale resolution to help me increase GPU memory allocation. In the game settings you can change that scaling option by a percentage: I went from 110% to 150% in 10% increments, increasing the load on the GPU with each step.

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Memory allocation between the two SLI configurations was similar, but not as perfectly aligned with each other as we saw with our single GPU testing.

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In a couple of cases, at 120% and 130% scaling, the GTX 970 cards in SLI are actually each using more memory than the GTX 980 cards. That difference is only ~100MB but that delta was not present at all in the single GPU testing.

Continue reading our look at Frame Rating comparisons between GTX 970 and GTX 980 cards in SLI!

Author:
Manufacturer: NVIDIA

A Summary Thus Far

UPDATE 2/2/15: We have another story up that compares the GTX 980 and GTX 970 in SLI as well.

It has certainly been an interesting week for NVIDIA. It started with the release of the new GeForce GTX 960, a $199 graphics card that brought the latest iteration of Maxwell's architecture to a lower price point, competing with the Radeon R9 280 and R9 285 products. But then the proverbial stuff hit the fan with a memory issue on the GeForce GTX 970, the best selling graphics card of the second half of 2014. NVIDIA responded to the online community on Saturday morning but that was quickly followed up with a more detailed expose on the GTX 970 memory hierarchy, which included a couple of important revisions to the specifications of the GTX 970 as well.

At the heart of all this technical debate is a performance question: does the GTX 970 suffer from lower performance because of of the 3.5GB/0.5GB memory partitioning configuration? Many forum members and PC enthusiasts have been debating this for weeks with many coming away with an emphatic yes.

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The newly discovered memory system of the GeForce GTX 970

Yesterday I spent the majority of my day trying to figure out a way to validate or invalidate these types of performance claims. As it turns out, finding specific game scenarios that will consistently hit targeted memory usage levels isn't as easy as it might first sound and simple things like the order of start up can vary that as well (and settings change orders). Using Battlefield 4 and Call of Duty: Advanced Warfare though, I think I have presented a couple of examples that demonstrate the issue at hand.

Performance testing is a complicated story. Lots of users have attempted to measure performance on their own setup, looking for combinations of game settings that sit below the 3.5GB threshold and those that cross above it, into the slower 500MB portion. The issue for many of these tests is that they lack access to both a GTX 970 and a GTX 980 to really compare performance degradation between cards. That's the real comparison to make - the GTX 980 does not separate its 4GB into different memory pools. If it has performance drops in the same way as the GTX 970 then we can wager the memory architecture of the GTX 970 is not to blame. If the two cards perform differently enough, beyond the expected performance delta between two cards running at different clock speeds and with different CUDA core counts, then we have to question the decisions that NVIDIA made.

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There has also been concern over the frame rate consistency of the GTX 970. Our readers are already aware of how deceptive an average frame rate alone can be, and why looking at frame times and frame time consistency is so much more important to guaranteeing a good user experience. Our Frame Rating method of GPU testing has been in place since early 2013 and it tests exactly that - looking for consistent frame times that result in a smooth animation and improved gaming experience.

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Users at reddit.com have been doing a lot of subjective testing

We will be applying Frame Rating to our testing today of the GTX 970 and its memory issues - does the division of memory pools introduce additional stutter into game play? Let's take a look at a couple of examples.

Continue reading our look at GTX 970 Performance Testing using Frame Rating!

Author:
Manufacturer: AMD

A Powerful Architecture

AMD likes to toot its own horn. Just a take a look at the not-so-subtle marketing buildup to the Radeon R9 295X2 dual-Hawaii graphics card, released today. I had photos of me shipped to…me…overnight. My hotel room at GDC was also given a package which included a pair of small Pringles cans (chips) and a bottle of volcanic water. You may have also seen some photos posted of a mysterious briefcase with its side stickered by with the silhouette of a Radeon add-in board.

This tooting is not without some validity though. The Radeon R9 295X2 is easily the fastest graphics card we have ever tested and that says a lot based on the last 24 months of hardware releases. It’s big, it comes with an integrated water cooler, and it requires some pretty damn specific power supply specifications. But AMD did not compromise on the R9 295X2 and, for that, I am sure that many enthusiasts will be elated. Get your wallets ready, though, this puppy will run you $1499.

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Both AMD and NVIDIA have a history of producing high quality dual-GPU graphics cards late in the product life cycle. The most recent entry from AMD was the Radeon HD 7990, a pair of Tahiti GPUs on a single PCB with a triple fan cooler. While a solid performing card, the product was released in a time when AMD CrossFire technology was well behind the curve and, as a result, real-world performance suffered considerably. By the time the drivers and ecosystem were fixed, the HD 7990 was more or less on the way out. It was also notorious for some intermittent, but severe, overheating issues, documented by Tom’s Hardware in one of the most harshly titled articles I’ve ever read. (Hey, Game of Thrones started again this week!)

The Hawaii GPU, first revealed back in September and selling today under the guise of the R9 290X and R9 290 products, is even more power hungry than Tahiti. Many in the industry doubted that AMD would ever release a dual-GPU product based on Hawaii as the power and thermal requirements would be just too high. AMD has worked around many of these issues with a custom water cooler and placing specific power supply requirements on buyers. Still, all without compromising on performance. This is the real McCoy.

Continue reading our review of the AMD Radeon R9 295X2 8GB Dual Hawaii Graphics Card!!

Podcast #294 - Frame Rating Mantle in BF4, DirectX 12, Sub-$700 4K Monitors and more!

Subject: General Tech | April 3, 2014 - 01:30 PM |
Tagged: video, Samsung, podcast, Mantle, Glacer 240L, GDC 2014, frame rating, dx12, cooler master, BUILD 2014, BF4, amd, adata, 4k

PC Perspective Podcast #294 - 04/03/2014

Join us this week as we discuss Frame Rating Mantle in BF4, DirectX 12, Sub-$700 4K Monitors and more!

You can subscribe to us through iTunes and you can still access it directly through the RSS page HERE.

The URL for the podcast is: http://pcper.com/podcast - Share with your friends!

  • iTunes - Subscribe to the podcast directly through the iTunes Store
  • RSS - Subscribe through your regular RSS reader
  • MP3 - Direct download link to the MP3 file

Hosts: Ryan Shrout, Jeremy Hellstrom, Josh Walrath and Allyn Malventano

 
This podcast is brought to you by Coolermaster, and the CM Storm Pulse-R Gaming Headset!
 
Program length: 1:12:29
 
  1. Week in Review:
  2. 0:43:40 This podcast is brought to you by Coolermaster, and the CM Storm Pulse-R Gaming Headset
  3. News items of interest:
  4. Hardware/Software Picks of the Week:
    1. Allyn: Like MAME? Try MESS, and further - UME (systems list)
  5. Closing/outro

Be sure to subscribe to the PC Perspective YouTube channel!!

 

Author:
Manufacturer: AMD

BF4 Integrates FCAT Overlay Support

Back in September AMD publicly announced Mantle, a new lower level API meant to offer more performance for gamers and more control for developers fed up with the restrictions of DirectX. Without diving too much into the politics of the release, the fact that Battlefield 4 developer DICE was integrating Mantle into the Frostbite engine for Battlefield was a huge proof point for the technology. Even though the release was a bit later than AMD had promised us, coming at the end of January 2014, one of the biggest PC games on the market today had integrated a proprietary AMD API.

When I did my first performance preview of BF4 with Mantle on February 1st, the results were mixed but we had other issues to deal with. First and foremost, our primary graphics testing methodology, called Frame Rating, wasn't able to be integrated due to the change of API. Instead we were forced to use an in-game frame rate counter built by DICE which worked fine, but didn't give us the fine grain data we really wanted to put the platform to the test. It worked, but we wanted more. Today we are happy to announce we have full support for our Frame Rating and FCAT testing with BF4 running under Mantle.

A History of Frame Rating

In late 2012 and throughout 2013, testing graphics cards became a much more complicated beast. Terms like frame pacing, stutter, jitter and runts were not in the vocabulary of most enthusiasts but became an important part of the story just about one year ago. Though complicated to fully explain, the basics are pretty simple.

Rather than using software on the machine being tested to measure performance, our Frame Rating system uses a combination of local software and external capture hardware. On the local system with the hardware being evaluated we run a small piece of software called an overlay that draws small colored bars on the left hand side of the game screen that change successively with each frame rendered by the game. Using a secondary system, we capture the output from the graphics card directly, intercepting it from the display output, in real-time in an uncompressed form. With that video file captured, we then analyze it frame by frame, measuring the length of each of those colored bars, how long they are on the screen, how consistently they are displayed. This allows us to find the average frame rate but also to find how smoothly the frames are presented, if there are dropped frames and if there are jitter or stutter issues. 

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Continue reading our first look at Frame Rating / FCAT Testing with Mantle in Battlefield 4!!

Podcast #285 - Frame Rating AMD Dual Graphics with Kaveri, Linux GPU Performance, and Dogecoin Mining!

Subject: General Tech | January 30, 2014 - 02:32 PM |
Tagged: podcast, frame rating, video, amd, Kaveri, A10 7850K, dual graphics, linux, opengl, Lenovo, IBM

PC Perspective Podcast #285 - 01/30/2014

Join us this week as we discuss Frame Rating AMD Dual Graphics with Kaveri, Linux GPU Performance, and Dogecoin Mining!

You can subscribe to us through iTunes and you can still access it directly through the RSS page HERE.

The URL for the podcast is: http://pcper.com/podcast - Share with your friends!

  • iTunes - Subscribe to the podcast directly through the iTunes Store
  • RSS - Subscribe through your regular RSS reader
  • MP3 - Direct download link to the MP3 file

Hosts: Ryan Shrout, Jeremy Hellstrom, Josh Walrath and Allyn Malventano

 
Program length: 1:02:01
  1. Week in Review:
  2. News items of interest:
    1. 0:37:45 Quick Linux mention
      1. And Motorola Mobility
  3. Hardware/Software Picks of the Week:
  4. Closing/outro

Be sure to subscribe to the PC Perspective YouTube channel!!

 

Podcast #280 - NVIDIA GRID Beta, R9 290X Custom Coolers, 2TB SSDs and more!

Subject: General Tech | December 12, 2013 - 01:35 AM |
Tagged: z87, xfire, video, shield, R9 290X, podcast, pcper, nvidia, litecoin, grid, frame rating, eyefinity, crossfire, amd

PC Perspective Podcast #280 - 12/12/2013

Join us this week as we discuss the NVIDIA GRID Beta, R9 290X Custom Coolers, 2TB SSDs and more!

You can subscribe to us through iTunes and you can still access it directly through the RSS page HERE.

The URL for the podcast is: http://pcper.com/podcast - Share with your friends!

  • iTunes - Subscribe to the podcast directly through the iTunes Store
  • RSS - Subscribe through your regular RSS reader
  • MP3 - Direct download link to the MP3 file

Hosts: Ryan Shrout, Josh Walrath, Allyn Malventano and Scott Michaud

 
Program length: 1:09:46
  1. Week in Review:
  2. News items of interest:
  3. Hardware/Software Picks of the Week:
    1. Allyn: Windows 8.1 tweaks at WinAero.com
  4. Closing/outro

 

AMD Expects Beta Eyefinity Fix in January

Subject: General Tech, Graphics Cards | December 11, 2013 - 05:58 PM |
Tagged: frame pacing, frame rating, amd, southern islands, 4k, eyefinity, crossfire, microstutter

The frame pacing issue has been covered at our website for almost a year now. It stems from the original "microstutter" problem which dates back over a year before we could quantify it. We like to use the term "Frame Rating" to denote the testing methodology we now use for our GPU tests.

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AMD fared worse at these tests than NVIDIA (although even they had some problems in certain configurations). They have dedicated a lot of man-hours to the problem resulting in a driver updates for certain scenarios. Crossfire while utilizing Eyefinity or 4K MST was one area they did not focus on. The issue has been addressed in Hawaii and AMD asserted that previous cards will get a software fix soon.

The good news is that we have just received word from AMD that they plan on releasing a beta driver for Southern Islands and earlier GPUs (AMD believes it should work for anything that's not "legacy"). As usual, until it ships anything could change, but it looks good for now.

The beta "frame pacing" driver addressing Crossfire with 4K and Eyefinity, for supported HD-series and Southern Islands-based Rx cards, is expected to be public sometime in January.

Source: AMD
Author:
Manufacturer: AMD

A bit of a surprise

Okay, let's cut to the chase here: it's late, we are rushing to get our articles out, and I think you all would rather see our testing results NOW rather than LATER.  The first thing you should do is read my review of the AMD Radeon R9 290X 4GB Hawaii graphics card which goes over the new architecture, new feature set, and performance in single card configurations. 

Then, you should continue reading below to find out how the new XDMA, bridge-less CrossFire implementation actually works in both single panel and 4K (tiled) configurations.

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A New CrossFire For a New Generation

CrossFire has caused a lot of problems for AMD in recent months (and a lot of problems for me as well).  But, AMD continues to make strides in correcting the frame pacing issues associated with CrossFire configurations and the new R9 290X moves the bar forward.

Without the CrossFire bridge connector on the 290X, all of the CrossFire communication and data transfer occurs over the PCI Express bus that connects the cards to the entire system.  AMD claims that this new XDMA interface was designed for Eyefinity and UltraHD resolutions (which were the subject of our most recent article on the subject).  By accessing the memory of the GPU through PCIe AMD claims that it can alleviate the bandwidth and sync issues that were causing problems with Eyefinity and tiled 4K displays.

Even better, this updated version of CrossFire is said to compatible with the frame pacing updates to the Catalyst driver to improve multi-GPU performance experiences for end users.

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When an extra R9 290X accidentally fell into my lap, I decided to take it for a spin.  And if you have followed my graphics testing methodology in the past year then you'll understand the important of these tests.

Continue reading our article Frame Rating: AMD Radeon R9 290X CrossFire and 4K Preview Testing!!

Author:
Manufacturer: AMD

A slightly new architecture

Note: We also tested the new AMD Radeon R9 290X in CrossFire and at 4K resolutions; check out that full Frame Rating story right here!!

Last month AMD brought media, analysts, and customers out to Hawaii to talk about a new graphics chip coming out this year.  As you might have guessed based on the location: the code name for this GPU was in fact, Hawaii. It was targeted at the high end of the discrete graphics market to take on the likes of the GTX 780 and GTX TITAN from NVIDIA. 

Earlier this month we reviewed the AMD Radeon R9 280X, R9 270X, and the R7 260X. None of these were based on that new GPU.  Instead, these cards were all rebrands and repositionings of existing hardware in the market (albeit at reduced prices).  Those lower prices made the R9 280X one of our favorite GPUs of the moment as it offers performance per price points currently unmatched by NVIDIA.

But today is a little different, today we are talking about a much more expensive product that has to live up to some pretty lofty goals and ambitions set forward by the AMD PR and marketing machine.  At $549 MSRP, the new AMD Radeon R9 290X will become the flagship of the Radeon brand.  The question is: to where does that ship sail?

 

The AMD Hawaii Architecture

To be quite upfront about it, the Hawaii design is very similar to that of the Tahiti GPU from the Radeon HD 7970 and R9 280X cards.  Based on the same GCN (Graphics Core Next) architecture AMD assured us would be its long term vision, Hawaii ups the ante in a few key areas while maintaining the same core.

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Hawaii is built around Shader Engines, of which the R9 290X has four.  Each of these includes 11 CU (compute units) which hold 4 SIMD arrays each.  Doing the quick math brings us to a total stream processor count of 2,816 on the R9 290X. 

Continue reading our review of the AMD Radeon R9 290X 4GB Graphics Card!!