Upgrading to X1900 XT on a Mac Pro - How to get power to the card?

Discussion in 'Mac Pro' started by koopatroopa, Sep 6, 2006.

  1. koopatroopa macrumors newbie

    Sep 6, 2006
    So I went and bought myself a mac pro with a Gforce 7300 as soon as they came out, thinking I would buy an off the shelf ATI X1900 XT and put into the mac myself in order to avoid the delay of getting the computer 6 weeks later. (also, a lot cheaper than buying the card from apple)
    I went in to the apple store in SoHo NY and asked a very helpful guy there if this was at all possible, and he told me that I should be fine and that the Mac Pro uses a standard PC version of the Radeon X1900 XT. So, I bought a ATI card from ebay which saved me a lot of money....However, here the problem: The ATI card requires additional power than the 300 W the bus can provide, and there IS NO APPARENT way of feeding that power into the card. There's no extra cable in the chassis of the standard configuration Mac Pro so that you could easily upgrade the card. The only solution I can think of is to get a cable that takes power from the 4 pin ATI power connector for the second cd-rom bay, and converts into a 6 pin PCI Express connector. You can find these cables in any well stocked computer store, or online. I wonder though if the ATI X1900 XT upgrade kit that Apple sells has a similar solution and provides an extra cable? Am I stupid, and are there in-fact already supplied means of providing power to the card in there already?

    I'd love to hear if anyone else has better solution? There seems to be some power outlets on the motherboard for extra SATA discs, and perhaps there is a way to get power from those into the ATI card...

    I've seen on some forums that people have upgraded their cards in their mac pros, but I wonder how they solved the power problem?

    Thanks guys.
  2. [G5]Hydra macrumors regular

    Jul 2, 2004
    You can't use a PC 1900XT in a MacPro under OSX. It will likely work fine under XP but not in OSX.

    -Jerry C.

    BTW - the power comes from connectors on the motherboard in the PCIe part of the case near the front. They look like small black rectangular plastic pieces. The Apple kit comes with cables that you attach to these connectors.
  3. [G5]Hydra macrumors regular

    Jul 2, 2004
  4. koopatroopa thread starter macrumors newbie

    Sep 6, 2006

    I wonder if this is really confirmed? It seems a lot of people on apples forums are of a different opinion in terms of there being a mac specific version of the X1900.

    You might be right though.
  5. apfhex macrumors 68030


    Aug 8, 2006
    Northern California
    This has been confirmed a hundred times on multiple websites. PC graphics cards don't work in OS X on the Mac Pro. They should work in Windows, though.
  6. koopatroopa thread starter macrumors newbie

    Sep 6, 2006
    Ah,...bollox. That's what you get for being impatient.
  7. sirnh macrumors regular

    Aug 16, 2006

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