iMac CPUs for 2017 iMac refresh announced

Discussion in 'iMac' started by mpe, Jan 3, 2017.

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  1. mpe, Jan 3, 2017
    Last edited: Jan 3, 2017

    mpe macrumors 6502

    Sep 3, 2010
    It looks like we now have clarity about CPUs for 2017 iMac.

    My expectation for entry level 27" is:

    i5-7500 3.4 GHz (3.8 GHz turbo) 6MB L2
    (I would be surprised if they cripple this configuration with even slower CPU or integrated GPU)

    i5-7600K 3.8 GHz (4.2 GHz turbo) 6MB L2

    BTO high-end
    i7-7700K 4.2 GHz (4.5 GHz turbo) 8 MB L2

    I expect all models to ship with 2400 MHz DDR4 RAMs.

    Given by the fact the Kaby Lake chips use the exactly same architecture as Skylake with same IPC and performance is proportional to turbo frequency we can expect relatively modest 10-15% performance gain in the best case.

  2. jetjaguar macrumors 68030


    Apr 6, 2009
    Hmm I thought the cpus they just announced don't support ddr4
  3. ivoruest macrumors 6502


    Jul 12, 2010
    The problem lies on which cards are they going to use. If they keep the radeons, performance on the 5K or even the 4K will still not be as good as it should. Those screens really need some serious GPUs...
  4. mpe thread starter macrumors 6502

    Sep 3, 2010
    They do. DDR4-2400/DDR3L-1600. Only 2 channels. 4 channel models will presumably come later this year.

    Even Skylake chips used in iMacs supported DDR4-2133. In fact Skylake doesn't (officially) support DDR3, only DDR-3L (which Apple use).

    Since Kaby Lake DDR4 controller only supports 1 DPC of SODIMMs, we can only bet if we ever get again four memory slots in iMacs. Or perhaps soldered-in RAM? :)
  5. jetjaguar macrumors 68030


    Apr 6, 2009
    Would be amazing if they could fit a desktop 1080 like razer does in their laptop
  6. Lesser Evets macrumors 68040

    Lesser Evets

    Jan 7, 2006
    That's a little sad. I was hoping for that 20-25% boost so talked about.
  7. cynics macrumors G4

    Jan 8, 2012
    Not for general use or even video editing and photo editing.

    Displaying a 4k-5k image or video all comes down to the decoder and bandwidth. This is why TVs, settop boxes (like Roku) and modern 4k smartphones can do it so easily.

    3d rendering and gaming is a different story and yes a better GPU is always better for those.

    I prefer whatever runs the coolest and quietest which tends to not be AMD unfortunately.
  8. fastlanephil macrumors 65816


    Nov 17, 2007
    Maybe that was Skylake/Purley E5 Xeon.
  9. cynics macrumors G4

    Jan 8, 2012
    I know I shouldn't look a gift horse in the mouth however I feel the 5k iMac is built for 4k video editing and it does other stuff very well but the resolution and color gamut seem to indicate that.

    So it would be nice to see an iMac with a higher core count for faster video encoding. If you were building a video editing rig you'd likely overlook the 7700k unless you had other task relying on core clock. Like gaming for example however we all know how Macs are with gaming.

    Sometimes I hate being so cynical but I feel this is just so people don't settle for the iMac instead of the Mac Pro (assuming its updated). However taking TDP and cost into account I guess the Extreme Edition CPU's are a little unrealistic.
  10. yellowscreen macrumors regular


    Nov 11, 2015
    they'll do it with coffee lake later this year or 2018, 6 cores mainstream. they gotta compete with ryzen
  11. varian55zx macrumors 6502a


    May 10, 2012
    San Francisco
    Pretty fair improvement over the current gen, but my i5 6600 is still more than capable of handling any of the office work and Chrome usage I throw at it.
  12. kblbn86 macrumors member

    Aug 20, 2016
    Is AMD ryzen + vega combo a possibility for the iMac?
  13. Malus120 macrumors 6502

    Jun 28, 2002
    I'm hoping so :)
    But to be honest I don't suggest getting your hopes up too high. It'd be one of Apple's best kept secret since the 2013 Mac Pro.
  14. maflynn Moderator


    Staff Member

    May 3, 2009
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