Will two video cards work in Macpro/Windows 7?

Discussion in 'Mac Pro' started by jchall30, Dec 4, 2011.

  1. jchall30 macrumors newbie

    Oct 9, 2011
    I currently have a 2010 Macpro with a 5870 in it and would like to know if I added a 5770 to drive a second monitor would it also work on my Windows 7 partition? I know that it will work in OSX. I am wanting to do this so I can use the 5870 solely for the first screen for gaming and not have to split the video ram over two screens. Thanks in advance for the help. :)
  2. CaptainChunk macrumors 68020


    Apr 16, 2008
    Phoenix, AZ
    Yes, it would work, but you would have to get power to the 5770. The 5870 already uses both of the PCIe power headers on the logic board.

    Some people branch off the SATA power from the second optical drive bay using an adapter. But the better (safer) method would be to use a 5.25" PSU fitted to the lower optical drive bay.
  3. jchall30 thread starter macrumors newbie

    Oct 9, 2011
    I got the power part. Just wondering about dual cards under windows. So that will work then? One card for one screen and one for the other?
  4. jchall30 thread starter macrumors newbie

    Oct 9, 2011
    Thanks for the replys. I think that's what I am going to do.
  5. ymw macrumors newbie

    Dec 9, 2011
    Hi, jchall,
    How do you resolve the power problem? There are only two power
    plugs in the main board and 5870 need two. I think that HD 5770
    need power too. How do you get extra power plug? I want to have
    two cards too, but would like to know how to get power to the second
  6. applegeek897 macrumors regular

    Aug 23, 2011
    I think you should get another 5870 not from apple to save cost and run it in crossfire, will not effect OSX and you will be able to run both display off one card. The only thing you will need to do is get a small PSU to run from the optical drive bay or get PCI-E adapter.
  7. jchall30 thread starter macrumors newbie

    Oct 9, 2011
    Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3)

    Don't really want to fool with crossfire at this time. The 5870 is enough for my main screen and the 5770 for the second for now. I just hope it isn't to much trouble under Windows and the extended desktop is seamless like it is under OSX.

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