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Intel Readies Haswell Variants with Large Graphics Cores, and eDRAM Caches

Discussion in 'News' started by btarunr, Apr 16, 2013.

  1. btarunr

    btarunr Editor & Senior Moderator Staff Member

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    To tackle upcoming generations of Ultrabooks and NUC that lack space for discrete graphics, yet having to keep up with the demands of higher display resolutions (i.e. proliferation of 3840 x 2160), Intel is designing special variants of its Core "Haswell" processors that feature large integrated graphics cores bolstered by fourth-level eDRAM caches on-package. Pictured below, is one such contraption.

    The graphics-enhanced Core "Haswell" processor is an MCM (multi-chip module) of two dies, the larger one is the actual "Haswell" processor complex with cores, uncore, and the larger GT3 integrated graphics core. While the standard Haswell silicon with GT1 and GT2 integrated GPU options, physically features up to 20 execution units (EUs), the large GT3 silicon features double that, at 40 EUs.

    [​IMG] [​IMG]

    The first slide below details the Haswell GT3 package, while the second one details a standard Core "Haswell" implementation. You'll notice that apart from a larger graphics core, the processor features an additional stop on its ring-bus, the eDRAM PHY, interfacing with an external eDRAM silicon (the smaller chip on the MCM). Treated as L4 cache, the eDRAM chip provides higher bandwidth and lower latency than the main memory, for the graphics core to temporarily hold whatever it's working on, without clogging the main memory bus much. This is similar in principle to AMD's Sideport Memory, use of small amounts of faster memory on the motherboard to boost integrated graphics performance.

    [​IMG] [​IMG]

    Haswell GT3 is being designed to offer graphics performance that rivals discrete GPUs from NVIDIA and AMD under the 20W TDP envelope. Haswell GT3 (the entire package) itself features a TDP of 55W, which may seem high for Ultrabooks, but are backed by power management features that work to reduce the net power draw. Intel believes Haswell GT3 could provide a viable alternative to standard Haswell silicon aided by discrete GPUs.

    Source: VR-Zone
    Last edited: Apr 16, 2013
    Ikaruga and timmyisme22 say thanks.
  2. slim142

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    Do you guys think the rMPB 13" will have any chance of having Haswell GT3e?

    I mean, it would be awesome to have GT3e as an option for the 13" rMPB, but I honestly dont see how would such a small laptop be able to keep it cool with a 55 TDP.
  3. wickerman

    wickerman

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    well the top processor in the existing 13" is the 3ghz/35w dual core i7 (3540QM?), but when Apple did their minor revision shortly after launch they changed the internal layout and it was speculated they did so to prepare for Haswell. If you look at the teardown by ifixit, there is actually some wasted space internally where the SSD is mounted under the trackpad, something Apple - or any laptop designer really, would not normally do. So odds are they have some revision of the board, chassis, and battery layout that would allow for a chip with higher cooling demands.
    Last edited: Apr 16, 2013
  4. Ikaruga

    Ikaruga

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    The additional EDRAM might require extra compiler/driver support, but it could significantly increase the performance of the GPU. Good move from Intel.
  5. lemonadesoda

    lemonadesoda

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    ...looks around for this wanted proliferation ...cannot find
    AlienIsGOD says thanks.
  6. Sasqui

    Sasqui

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    At what point will Intel really be competing with mid range discreet graphics? They're already eating into AMD and NV space as it is.
  7. scazbala86

    scazbala86

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    I'd be curious what kind of mobile APU AMD could come up with with a 55w TDP.
  8. slim142

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    Well, thats interesting. However, is important to keep in mind that assuming they do put GT3e in it, how hot will the macbook get compared to current models? How much louder will it have to be too keep it in appropriate temps?

    I currently have an ASUS G1S with a 35 watt TDP CPU & a Geforce 8600M GT and trust me, next laptop I get HAS to be cooler than this BBQ machine.
  9. Baum

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    @slim142
    i know that generation of laptop too well ^^
    got myself a c2d with tdp of 35 and an X1900M GPU which cooks your hand and eats battery..
    i could have changed it for an 8600GT or 8400GS but i went with my HD4650 (mxm modules)

    Just use a copper block, an not some "tin"-can fins with a radial whiner!


    mmc module anyone? ah good old days with p1 with mmx, 166Mhz on mmc-1 module looks the same :p
  10. D4S4

    D4S4

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    how large is the cache?
  11. Aquinus

    Aquinus Resident Wat-man

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    There is a reason why Apple uses aluminum chassis. It helps when the case can dissipate heat. I don't expect it to be any louder, but that depends on how much the heat the thing puts out. If it doesn't consume more power it's not going to make more heat and Intel is doing a pretty good job at the efficiency thing on their mainstream platforms for both desktops and mobile devices. The i5 in my air which has a HD 4000 in it can get toasty if I'm compiling something in Macports, but most of the time the CPU doesn't get stressed enough to heat it up all that much. More often than not my air is quiet and pretty cool running.
  12. CounterZeus

    CounterZeus

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    I had the X1900 mobility radeon as well, noisy thing..

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