The Intel Skylake Mobile and Desktop Launch, with Architecture Analysisby Ian Cutress on September 1, 2015 11:05 PM EST
As with any launch, there are numbers abound from Intel to explain how the performance and experience of Skylake is better than previous designs as well as the competition.
As with Haswell and Broadwell, Intel is implementing a mobile first design with Skylake. As with any processor development structure the primal idea is to focus on one power point as being the most efficient and extend that efficiency window as far in either direction as possible. During IDF, Intel stated that having an efficiency window from 4.5W to 91W is a significant challenge, to which we agree, as well as improving both performance and power consumption over Broadwell at each stage.
Starting at 4.5W, we spoke extensively with parts of Intel at IDF due to our Broadwell-Y coverage. From their perspective Broadwell-Y designs were almost too wide ranging, especially for what is Intel’s premium low-power high performance product, and for the vendors placing it in an ill-defined chassis far away from Intel’s recommended designs gave concern to the final performance and user experience. As a result, Intel’s guidelines to OEMs this generation are tightened so that the designers looking for the cheaper Core M plastic implementations can tune their design to get the best out of it. Intel has been working with a few of these (both entry Core M and premium models) to enact the user experience model.
Overall however, Intel is claiming 40% better graphics performance for Core M with the new Generation 9 (Gen9) implementation, along with battery saving and compatibility with new features such as RealSense. Because Core-M will find its way into products from tablets to 2-in-1s and clamshells, we’ve been told that the Skylake design should hit a home-run against the best-selling tablets in the market, along with an appropriate Windows 10 experience. When we get units in to review, we will see what the score is from our perspective on that one.
For the Skylake-Y to Skylake-U transition (and in part, Skylake-H), Intel is claiming a 60% gain in efficiency over Haswell-U. This means either 60% less active power during media consumption or 60% more CPU performance at the same power (measured by synthetics, specifically SPECint_base_rate2006). The power consumption metrics comes from updates relating to the Gen9 graphics, such as multi-plane overlay and fixed-function decoders, as well as additional power/frequency gating between the unslice and slices. We will cover this later in the review. The GPU itself, due to the new functionality, is claiming 40% better graphics performance for Core M during 3DMark synthetic tests.
While not being launched today, Intel’s march on integrated graphics is also going to continue. With the previous eDRAM parts, Intel took the crown for absolute IGP performance from AMD, albeit being in a completely different price band. With Skylake, the introduction of a 4+4e model means that Intel’s modular graphics design will now extend from GT1 to GT4, where GT4e has 72 execution units with 128MB of eDRAM in tow. This leads to the claim that GT4e is set to match/beat a significant proportion of the graphics market today.
Back in our Skylake-K review, we were perhaps unimpressed with the generational gain in clock-for-clock performance, although improved multi-threading and frequency ranges helped push the out-of-the-box experience. The other side of that performance is the power draw, and because Skylake is another mobile-first processor, the power aspect becomes important down in mobile devices. We will go through some of these developments to improve power consumption in this article.
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tipoo - Tuesday, September 1, 2015 - linkThe bit of eDRAM on even ultrabook parts may be one of the more exciting bits of Skylake. Should bring baseline performance up significantly, even with half the eDRAM of the Pro 5200.
tipoo - Tuesday, September 1, 2015 - link
That 72EU part also comes shockingly close to XBO GPU Gflop numbers, which, while not directly comparable, means integrated graphics will catch up to this gens consoles very soon.
RussianSensation - Wednesday, September 2, 2015 - linkBut it's irrelevant in the real world for 5 reasons:
1) Intel's best CPUs don't focus on IGP (i.e., i7-6600K, 6700K, 5820K-5960X) which means someone who is interested in gaming is buying a dedicated i5/i7, especially K series and going for a discrete graphics card.
2) Since we are discussing PC gaming, not console gaming, a budget gamer is going to be better off getting a lower end discrete GPU like the $90 GTX750Ti or even going on the used market and buying a $100 HD7970/GTX670, instead of trying to play games on Intel's 72 EU part.
3) Looking at historical pricing of Intel's parts with eDRAM, they'll probably cost almost as much as the Xbox One/PS4.
4) No one buys an Xbox One/PS4 because they want the best graphics. If you want that, you build a Core i7 + GTX980Ti SLI/Fury X CF system. People buy consoles for ease of use, to play online with their friends, and to have exclusives. In the areas the consoles excel, a 13-15" PC laptop with a 72 EU Intel part will fail miserably in comparison to the gaming experience one would get on a PS4/XB1 + large TV in the living room. Frankly, these 2 devices aren't competing with each other.
5) Overall cost of the device - a $300 Intel CPU is worthless without a motherboard, ram, SSD/HDD, keyboard, etc. That means trying to compare how fast an Intel's CPU with 72 EUs and EDRAM is vs. an Xbox One and PS4 and ignoring the Total System Cost is misleading.
I guarantee it that anyone interested in PC gaming could care less about Intel's IGP as any serious gamer will be getting a Skylake laptop with a Maxwell and next year a Pascal GPU.
HideOut - Wednesday, September 2, 2015 - linkNo where in his comment did he mention same performance and cost. He was merely making an observation.
Jumangi - Wednesday, September 2, 2015 - linkThat Intels Integrated graphics can finally match a ten year old console? Big deal...
IanHagen - Wednesday, September 2, 2015 - linkNo, that it matches a console released last year.
SunLord - Wednesday, September 2, 2015 - linkI doubt it they might be able to match the spec numbers but actual real world performance will likely still favor the console simply because of the specialized optimizations developers use on consoles vs the more generic options pc games are forced to use thanks to the near infinit hardware combinatiosn one can have
tuxRoller - Sunday, September 6, 2015 - linkThere's already a vulkan driver ready for Intel (on Linux) made by lunarg. That will allow for the optimizations needed if the developers care to make them.
Jumangi - Wednesday, September 2, 2015 - linkAhaha you think this thing will match an Xbox one? Wow the delusion is seriously big with some people. Also the cost of one of these high end Iris Pro CPUs alone will cost more than an entire console or a decent AMD laptop with still better graphics.
BillyONeal - Wednesday, September 2, 2015 - linkConsidering both the PS4 and XBO also use integrated graphics solutions from a couple years ago it isn't far fetched.