My friend has jsut changed from a ti4600 to a 6600 GT, and since the installation, he cant run any 3D applications in direct x. It reboots the system or crashes. He thought it might be his psu so got a new one. he also replaced the 6600 Gt for another brand. When it crashes there is still a picture, and the monitor doesnt standby.
Specs are below:
::> asrock k8t combo z
::> amd athlon 64 3000
::> corsair ddr400 512
::> tagan 480 watt
::> 28amps on the +12v line
Thanks lads