2012 iMac - Graphics Switching?

Discussion in 'iMac' started by Jonnybeats, Dec 14, 2012.

  1. Jonnybeats macrumors newbie

    Apr 15, 2010
    Bristol UK
    Hi guys,

    Just out of curiosity, do any of you guys know if the new 2012 iMac features the same graphics switching system as the new MBPs.
    I didn't see it noted anywhere on the Apple website.

    The concept for those of you unfamiliar is that the computer will only run the Nvidia discrete graphics chip when the computer is under load, reverting back to the Intel integrated graphics processor during less intensive tasks to save power.

    I'm not particularly fussed if it does or doesn't but it'd be a nice touch if it was featured on the iMac to reduce heat at idle.



    Damn iMac, arrive already... I can't wait until Wednesday!!
  2. bflowers macrumors 6502a

    Jul 19, 2006
    Apple support doesn't mention the 2012 iMac in the list of systems with both types of GPUs in use. There was no mention of it on the current iMac page.

  3. Gelite55 macrumors regular

    Dec 12, 2012
    No. I don't think so. It's a Desktop so power really isn't a issue.
  4. joe-h2o macrumors 6502a

    Jun 24, 2012
    Absolutely not.

    The CPU models that Apple has chosen for the iMac specifically exclude the more powerful integrated GPU - ie, they went for the cheaper "CPU only" i5's and i7's with the really old style token integrated parts (not the HD4000).

    There is no need for automatic graphics switching, since at idle the main GPU
    isn't even breaking sweat and under load you want the GPU to be doing the heavy lifting. There's simply no need to power down the dedicated GPU at idle or low loads since the only real benefit is battery life extension, and potentially heat reduction. Given that the iMac is virtually silent at low loads (ie, it's running quite cool enough) and doesn't have a battery to worry about switching to the integrated GPU is unnecessary.
  5. Jonnybeats thread starter macrumors newbie

    Apr 15, 2010
    Bristol UK
    Yeah, that was my thinking.

    Thanks for you input.
  6. theSeb macrumors 604


    Aug 10, 2010
    Poole, England
    The reason why Apple chose these CPUs is pretty clear. It's because there is no need for integrated graphics in an iMac. It's completely disabled.

    Let's compare from the same family. The 27" "high-spec" (not the ultimate BTO) has an i5-3470. Here it is


    It does indeed only have an HD2500. Because Intel expects any one using the CPU to include discrete graphics.

    Tray price? 184$

    If they went for the more expensive 3475s with the HD4000, what exactly would be the point?

    Tray Price? 201$

    What do we get? Clock Speed 2.9 GHz Max Turbo Frequency 3.6 GHz

    So the normal clock speed is actually slower than the CPU that was included in the iMac. It's actually better for the consumer that Apple chose this CPU over the one with the HD4000. The HD4000 is useless when the integrated graphics is disabled anyway.
  7. joe-h2o macrumors 6502a

    Jun 24, 2012
    That was my whole point :p

    There is no GPU-free i5 or i7 in the consumer range - they all have at least the old weaksauce one, or the HD4000. As you said, there's no reason to get the one with the HD4000. It costs more and is less effective. The dedicated GPU alone is fine for all operating modes.

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