A list of things that come to mind:
1. See if there are updates/patches available for the games that crash.
2. Try finding out what PSU you are using, even better if you can spot its power ratings/specifications.
There should be enough power on the rail for the GFX card to draw from.
3. Do you see a rise in the GFX card temperatures before the crash?
4. What motherboard are you using? If it doesn't support PCIe x16 2.0, a motherboard BIOS update might help.
Edited by ReviverSoft, 28 December 2009 - 01:53 PM.