Does the iMac burn extra power with a thunderbolt display?

Discussion in 'iMac' started by omvs, May 23, 2012.

  1. omvs macrumors 6502

    Joined:
    May 15, 2011
    #1
    I've noticed my iMac (27", late 2011) burns a fair amount more idle power with an external DVI (or HDMI/VGA) display hooked up. iStat Menus shows the GPU power jumping by 20+watts, which I find a bit annoying... I'm guessing some power-saving mode of the GPU is being disabled in this case -- its not much less than the power when I fire up a 3D game like diablo3.

    Does anyone know if the idle power is similarly high with a Thunderbolt display instead of a displayport variant? I was wondering if it might use a slightly different transport mechanism and avoid the problem....
     
  2. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #2
    You cannot drive two monitors on the same amount of power required to drive one monitor.
     
  3. omvs thread starter macrumors 6502

    Joined:
    May 15, 2011
    #3
    The GPU may have to do a TINY bit more work, plus another PHY needs to be turned on. But thats not 20watts worth.

    The max-power in 3D seems to be very similar with either just the internal display or with an extra, further suggesting its a bug.
     

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