your power supply is from powercool (80% efficient= 520 watts available when new)
since it is a modular power supply you might want to make sure your (2) 6 pin cables are plugged into separate rails on the power supply.
if that does not help, I think your only real fix will be to swap in a new quality power supply.
power required for GPU
- 75 watts from motherboard PCI slot
- 75 watts from 6 pin power connector #1
- 75 watts from 6 pin power connector #2
if one of the connectors is not providing power or both are from the same connection to the power supply
you will be short on power to the GPU. if that occurs then the GPU will try to pull too much power from the motherboard and the voltage to the CPU may drop too low and trigger the CPU reset line. Or the motherboard or PSU can detect the problem and also tell the CPU to reset. End result is the system restarts
since ive done that though its not glitching out when loading up counterstrike