Mac Pro 3.1 Problem with ATI 5870

Discussion in 'Mac Pro' started by Robjw, Nov 1, 2014.

  1. Robjw macrumors newbie

    Dec 13, 2007

    My Mac Pro 1.1 recently died completely - I suspect the PSU.

    I hunted around for a replacement, and have ended up with a second 1.1, and now a bargain 3.1.

    The 3.1 came with a flashed PC card, apparently a GT120. With that card, it works perfectly. However I have a 5870 from my dead 1.1. With this card installed I get horrible graphics corruption in both Yosemite and Snow Leopard. Interestingly it works OK in Snow Leopard (albeit sluggishly) until I install the 10.6.8 combo update, and then it craps out straight away.

    I thought that whatever had killed my 1.1 had also killed my 5870, but having tried it in my replacement 1.1, it works perfectly. As far as I know the 5870 should work in the 3.1 as well as it does in the 1.1.

    Anyone any ideas?
  2. 666sheep macrumors 68040


    Dec 7, 2009
    Yeah, reset NVRAM content on a 3,1. Should help.

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