The Claims

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.

The Intel Skylake Launch The Skylake Package: High Level Core and Power Delivery
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  • beastiful - Wednesday, September 2, 2015 - link

    And the point of releasing Q170 when vPro CPUs aren't ready yet is? Reply
  • jhh - Wednesday, September 2, 2015 - link

    I expect that most of the mobile Xeon will end up in an embedded system which needs the reliability of ECC, such as wireless core network, including functions such as transcoding which can use the GPU for audio/visual processing. The GPU actually makes for a pretty effective DSP, although not necessarily as power-efficient as a DSP. Reply
  • piasabird - Wednesday, September 2, 2015 - link

    A lot of CPU'S formerly Broadwell are in very short supply and often the suppliers are changing much more for them than they are worth. This is particularly true about IRIS graphics on the desktop. Reply
  • blakflag - Wednesday, September 2, 2015 - link

    At this point the only interest I have is for a cheap, ultra efficient media server to fill out my new, as-yet-unused mini-itx case. My Sandy bridge i5 is still doing quite well for my power machine. When the lower end stuff comes out I'll take a look. Reply
  • Hannibal80 - Wednesday, September 2, 2015 - link

    Wonderful article Reply
  • Hannibal80 - Wednesday, September 2, 2015 - link

    Doh! First comment, first fail. The "wonderful" was for the one about mobile cpu core count. What a shame Reply
  • Hannibal80 - Wednesday, September 2, 2015 - link

    By the way, this is still a good one ☺ Reply
  • Freakie - Wednesday, September 2, 2015 - link

    Silly question, but in the DMI 3.0 section, is 1pJ/bit supposed to be 1 picojoule per bit? Reply
  • extide - Saturday, September 5, 2015 - link

    Yes Reply
  • sonicmerlin - Wednesday, September 2, 2015 - link

    "For an architecture change, users (us included) have come to expect a 5-10% generation on generation increase at the same frequency"

    Uh... I expect a lot more than 5-10%. With ARM we get 30--40% every year.
    Reply

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