Mac Pro 2008 graphics card crashing I have a mac pro 2008, and the graphics card (nvidia 8800GT) has started to lock up - I can still move the mouse but cannot do anything in Windows 7 (I hardly use OSX latelly so dont know if it happens there).  The entire screen goes all garbled (various colours, flashing) and I have to reboot the machine.

The latest nvidia drivers for windows 7 have been installed, and until now everything has been rock solid.  

Does this sound like the graphics card is failing?  Or do I just need to tweak the cooling / fan speed on the card itself?  

If I do need to replace the card, can anyone recommend a decent replacement that would handle most current-gen PC games?
It does sound like the graphics card is failing. The garbled display is a symptom of this. 

If you only run Windows, any PC graphics card in your Mac Pro will work fine. 

What's more, the PC Radeon 58xx and 68xx cards work in OS X too, out of the box. 

I would recommend one of Radeon 5850, 5870, 6850 or 6870 if you want Mac compatibility, or any good graphics card within your budget if you only want to game in Windows.