2008 Mac Pro and GTX 275 in BootCamp success

Discussion in 'Mac Pro' started by peskaa, Apr 28, 2009.

  1. peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #1
    Just sharing my experience here :)

    I was originally running a 2008 2.8/8 with an 8800GT GPU, and wanted to up the GPU for Windows to something rather beefier - so I bought a BFG GTX 275. I was expecting some issues with running the cards, but it has been perfect. My solution is:

    OS X:
    1) Power lead to the 8800GT in Slot 2, no power to the GTX 275.
    2) 30" and 23" plugged into 8800GT, both working
    3) OS X boots perfectly, doesn't see the GTX 275, and hence the fans don't go into overdrive

    Vista:
    1) Power leads (two 6-pin off mainboard) to the GTX 275 in Slot 1, no power to the 8800GT.
    2) 30" Cinema Display plugged into GTX 275, works fine
    3) Boots perfectly, works a charm. Vista doesn't see the 8800GT and hence doesn't get into a tizzy over which card to use.


    Notes:
    Mac Pro is set to boot Vista by default, as I don't see any image on screen until the Vista loading screens (ie: I can't hold down alt and use the Boot Camp drive selection).


    Now, unplugging power/monitor leads is a little bit of a pain, but only takes around 30 seconds. I haven't had to go and bodge power from the optical bays (as I have two SuperDrives for a start) or an external source. The Mac seems to recognise the 8800GT in Slot 2 even when it isn't powered, enough for it to read the EFI ROM and allow booting. Personally, I find this a far easier, and tidier, solution than the ones presented so far (ie: with both cards running).
     
  2. Cindori macrumors 68040

    Cindori

    Joined:
    Jan 17, 2008
    Location:
    Sweden
    #2
    This is common knowledge? :)


    Some people use external power supplys to power both cards at once.




    And yes the 8800GT will work without power. But only at like 25% speed.
     

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