Hmm, let's think for a second. It's simple math actually. The temps are fine both on cpu and gpu, right? Then it's not throttling. You have 430W PSU. Your GPU uses
-in IDLE = 121 W -in FULL Stress = 279 W Your CPU uses -in IDLE = 72 W -in FULL Stress = 146 W +other things, for example in my configuration (one SSD, one 1TB HDD, 7 US3.0 ports, 6 USB2.0 ports, DVD RW drive etc) power draw is somewhere around 100 W, only from those small things Now, the math:
Your Cpu and Gpu both in full stress would use 425 W (achievable in synthesized tests, but not in the games)add USB ports, HDD and optical drives to that and you might push your power usage up to 500 W. Now, your PSU is 430 W, but it's probably "80 Plus Bronze", which means it really gives you around 85% of that power. 430*0,85= 365,5 W (that's Energy conversion efficiency (η)) Buy a better PSU. beQuiet 600W L8 should be good enough. EDIT: Oh and "random time computer shutdown" that has to be the PSU. You might even get BSOD's if the PSU is to weak. My friend had a similar situation with Radeon HD7950, but the problem occurred when he started overclocking his card and PSU was to weak to hold it.