Dual graphic/power issue?

Discussion in 'Mac Pro' started by xbro, Jun 21, 2013.

  1. xbro macrumors newbie

    Jun 21, 2013
    Hey everyone

    maybe you can help me. I recently upgraded my graphiccard to Evga Geforce 660TI everything works fine apart from bootscreen. I still have my old Ati 5870 Card. I know that I could use it, But is it possible to run both cards with the internal PSU? if yes, where do i find internal powersockets in the mac? If no, do you know where there's a guide for adding and external psu?

    thanks to all the guys and girl who helps us in the forum :)
  2. bsbeamer macrumors 65816

    Sep 19, 2012
    check the sticky at the top of this thread for non-EFI cards, lots of useful info in there. one power supply that several people have referenced previously is the FSP Booster X5 - may want to search the treads for it and more specific info.


    if you're going to go through the trouble (and expense) of adding an external PSU for a 660TI, then just get an EFI flashed 6XX series card instead - less mess and hassles, cleaner install, and less power consumption. if you were running TITAN's or multiple cards for CUDA, etc, then I'd see more of a reason for the additional PSU.
  3. xbro thread starter macrumors newbie

    Jun 21, 2013
    Hi Thanks for the Reply, I'm already using my 660TI but the idea was to make use of the old 5870 and if possible with the existing PSU I've tried to find threads with this, but I can't really find any specific on 5870 and Geforce 660TI that tells if it can be done.
  4. ElderBrE macrumors regular


    Apr 14, 2004
    First of all I think you should ask yourself if you have any applications that will make use of the second GPU or if it's just going to waste power.
  5. bsbeamer macrumors 65816

    Sep 19, 2012
    Why do you want to make use of the old 5870? Is there a specific reason that you want to have this card installed in addition to the 660TI? Are you doing work that relies on GPU acceleration, or can support multiple GPUs?

    People have used the EFI card (5870) for the displays and the non-EFI cards for GPU acceleration in the past - it was a popular setup for Mac's running Resolve and other software a few years ago. This isn't necessarily the case right now, however. Several of those folks have moved onto external enclosures for multiple GPUs (and/or more CUDA cores) and found those setups to work better - most bang for buck.
  6. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    Or you could get the 660 modified to engage boot screens...

    Sell the 5870 while it is still worth something
  7. xbro thread starter macrumors newbie

    Jun 21, 2013
    Hey again the idea was to use the old 5870 for monitors and open GL support and then leaving the cuda card to do my videorenders etc. I'm working in a mix of programs Premiere CC, Speedgrade, Resolve, After effects... but maybe the 660TI is enough. I was recommended by a friend to use both cards but now I will reconsider. Can anyone of you tell me if it's possible to put the to cards in with the internal PSU?

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