With the introduction of the Intel Kaby Lake processors and Intel Z270 chipset, unprecedented overclocking became the norm. The new processors easily hit a core speed of 5.0GHz with little more than CPU core voltage tweaking. This overclocking performance increase came with a price tag. The Kaby Lake processor runs significantly hotter than previous generation processors, a seeming reversal in temperature trends from previous generation Intel CPUs. At stock settings, the individual cores in the CPU were recording in testing at hitting up to 65C - and that's with a high performance water loop cooling the processor. Per reports from various enthusiasts sites, Intel used inferior TIM (thermal interface material) in between the CPU die and underside of the CPU heat spreader, leading to increased temperatures when compared with previous CPU generations (in particular Skylake). This temperature increase did not affect overclocking much since the CPU will hit 5.0GHz speed easily, but does impact the means necessary to hit those performance levels.
Like with the previous generation Haswell CPUs, a few of the more adventurous enthusiasts used known methods in an attempt to address the heat concerns of the Kaby Lake processor be delidding the processor. Unlike in the initial days of the Haswell processor, the delidding process is much more stream-lined with the availability of delidding kits from several vendors. The delidding process still involves physically removing the heat spreader from the CPU, and exposing the CPU die. However, instead of cooling the die directly, the "safer" approach is to clean the die and underside of the heat spreader, apply new TIM (thermal interface material), and re-affix the heat spreader to the CPU. Going this route instead of direct-die cooling is considered safer because no additional or exotic support mechanisms are needed to keep the CPU cooler from crushing your precious die. However, calling it safe is a bit of an over-statement, you are physically separating the heat spreader from the CPU surface and voiding your CPU warranty at the same time. Although if that was a concern, you probably wouldn't be reading this article in the first place.
Subject: Processors | January 3, 2017 - 03:54 PM | Jeremy Hellstrom
Tagged: z270, overclocking, kaby lake, Intel, i7-7700k, core i7-7700k, 7th generation core, 7700k, 14nm
Having already familiarized yourself with Intel's new Kaby Lake architecture and the i7-7700k processor in Ryan's review you may now be wondering how well the new CPU overclocks for others. [H]ard|OCP received three i7-7700k's and three different Z270 motherboards for testing and they set about overclocking these in combination to see what frequency they could reach. Only one of the chips was ever stable at 5GHz, and it is reassuring that it managed that on all three motherboards, the remaining two would only hit 4.8GHz which is still not a bad result. Drop by to see their settings in full detail.
"After having a few weeks to play around with Intel's new Kaby Lake architecture Core i7-7700K processors, we finally have some results that we want to discuss when it comes to overclocking and the magic 5GHz many of us are looking for, and what we think your chances are of getting there yourself."
Here are some more Processor articles from around the web:
- Intel's Core i7-7700K 'Kaby Lake' CPU @ The Tech Report
- Intel Kaby Lake i7-7700K & i5-7600K Review @ Hardware Canucks
- Intel Core i7-7700K vs 6700K: 22 Games, RX 480 & GTX 1080 @ techPowerUp
- ntel Kaby Lake Core i7-7700K Performance & Z270 Chipset Overview @ Techgage
- Intel 7th Generation Core i7 7700K Processor Review @ OCC
- Intel Kaby Lake Core i7-7700K IPC @ [H]ard|OCP
- Core i5-6400 @ Hardware Secrets
- FX-4300 @ Hardware Secrets
- AMD's New Ryzen CPU - SMT and IPC @ [H]ard|OCP
It probably doesn't surprise any of our readers that there has been a tepid response to the leaks and reviews that have come out about the new Core i7-7700K CPU ahead of the scheduled launch of Kaby Lake-S from Intel. Replacing the Skylake-based 6700K part as the new "flagship" consumer enthusiast CPU, the 7700K has quite a bit stacked against it. We know that Kaby Lake is the first in the new sequence of tick-tock-optimize, and thus there are few architectural changes to any portion of the chip. However, that does not mean that the 7700K and Kaby Lake in general don't offer new capabilities (HEVC) or performance (clock speed).
The Core i7-7700K is in an interesting spot as well with regard to motherboards and platforms. Nearly all motherboards that run the Z170 chipset will be able to run the new Kaby Lake parts without requiring an upgrade to the newly released Z270 chipset. However, the likelihood that any user on a Z170 platform today using a Skylake processor will feel the NEED to upgrade to Kaby Lake is minimal, to say the least. The Z270 chipset only offers a couple of new features compared to last generation, so the upgrade path is again somewhat limited in excitement.
Let's start by taking a look at the Core i7-7700K and how it compares to the previous top-end parts from the consumer processor line and then touch on the changes that Kaby Lake brings to the table.
With the beginning of CES just days away (as I write this), Intel is taking the wrapping paper off of its first gift of 2017 to the industry. As you can see from the slide above, more than just the Kaby Lake-S consumer socketed processors are launching today, but other components including Iris Plus graphics implementations and quad-core notebook implementations will need to wait for another day.
For DIY builders and OEMs, Kaby Lake-S, now known as the 7th Generation Core Processor family, offer some changes and additions. First, we will get a dual-core HyperThreaded processor with an unlocked designation in the Core i3-7350K. Other than the aforementioned Z270 chipset, Kaby Lake will be the first platform compatible with Intel Optane memory. (To be extra clear, I was told that previous processors will NOT be able to utilize Optane in its M.2 form factor.)
Though we have already witnessed Lenovo announcing products using Optane, this is the first official Intel discussion about it. Optane memory will be available in M.2 modules that can be installed on Z270 motherboards, improving snappiness and responsiveness. It seems this will be launched later in the quarter as we don't have any performance numbers or benchmarks to point to demonstrating the advantages that Intel touts. I know both Allyn and I are very excited to see how this differs from previous Intel caching technologies.
|Core i7-7700K||Core i7-6700K||Core i7-5775C||Core i7-4790K||Core i7-4770K||Core i7-3770K|
|Architecture||Kaby Lake||Skylake||Broadwell||Haswell||Haswell||Ivy Bridge|
|Socket||LGA 1151||LGA 1151||LGA 1150||LGA 1150||LGA 1150||LGA 1155|
|Base Clock||4.2 GHz||4.0 GHz||3.3 GHz||4.0 GHz||3.5 GHz||3.5 GHz|
|Max Turbo Clock||4.5 GHz||4.2 GHz||3.7 GHz||4.4 GHz||3.9 GHz||3.9 GHz|
|Memory Speeds||Up to 2400 MHz||Up to 2133 MHz||Up to 1600 MHz||Up to 1600 MHz||Up to 1600 MHz||Up to 1600 MHz|
|Cache (L4 Cache)||8MB||8MB||6MB (128MB)||8MB||8MB||8MB|
|System Bus||DMI3 - 8.0 GT/s||DMI3 - 8.0 GT/s||DMI2 - 6.4 GT/s||DMI2 - 5.0 GT/s||DMI2 - 5.0 GT/s||DMI2 - 5.0 GT/s|
|Graphics||HD Graphics 630||HD Graphics 530||Iris Pro 6200||HD Graphics 4600||HD Graphics 4600||HD Graphics 4000|
|Max Graphics Clock||1.15 GHz||1.15 GHz||1.15 GHz||1.25 GHz||1.25 GHz||1.15 GHz|