2008 Mac Pro and GTX 275 in BootCamp success

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

  1. peskaa macrumors 68020


    Mar 13, 2008
    London, UK
    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

    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.

    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


    Jan 17, 2008
    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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