Hi guys it will be very pleasant if you can help me, yesterday I bought thermaltake contac 30 cpu cooler and started to overclock my cpu when I tried to tweak the voltage to 1.39v and multiplier on 3.7 ghz windows booted normaly and prime95 worked fine for 2 hours ! but whenever I try to play anygame like bf3 after 3~5minutes the pc shuts down and wont open until I unplug the powersupply power cable and put it back ! what may be the problem with my overclocking ? maybe my psu is too bad ? if its too bad how could it handle prime95 for 2 hours without any bsod or any issues why only during games ? my psu is 680w but its mark is unknown XD hope you help me thnx !