MacPro3,1 + 8800GT issues

Discussion in 'Mac Pro' started by luh, Jun 29, 2011.

  1. luh macrumors newbie

    Jun 16, 2010
    Hello Macrumors community,
    I would like to share with you my dilemma...

    I have been trying to solve this issue since two months. Everytime an app or game needs graphic hardware, the Mac Pro freezes and the screen becomes greenish/purplish with dots appearing and disappearing all over it.

    I think is a graphic temperature issue. I opened the graphic card cover and remove all the dust and ***** accumulated for 3 years.

    I know the graphic card is alive because I am using it now to write this post. But I realized that the fan doesn't speed up when the graphic card needs to... I know it should work because when I switch on the Mac, the fan speeds up in the fan test (some secs before booting)...

    When playing Portal or any Steam about 30-40 secs my Mac freezes.
    When playing a Youtube video (Flash uses graphic hardware) in some minutes my Mac freezes.
    When I enter to Time Machine (OpenGL in the background) my Mac freezes in seconds.

    I tried to solve this problem but nothing worked.
    What should I do? Should I buy another graphic card? Replace the fan? Change the graphic cooling system? Wait for that rumored Mac Pro 2011 and its graphic cards?

    Thank you
  2. luh thread starter macrumors newbie

    Jun 16, 2010
  3. GlynJones macrumors 6502

    Jun 15, 2005
    Stick a 5770 in it. Relatively cheap upgrade or try and score an old 4870 off ebay like I did.
  4. CaptainChunk macrumors 68020


    Apr 16, 2008
    Phoenix, AZ
    Sounds to me like another dying 8800 GT. I suppose you could try the oven trick as a last resort.
  5. MaxHarryson macrumors newbie

    Jun 23, 2011
    Had the same symptoms, and now mine is dead. Get a new card, thats all u have to do

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