For example, when I'm playing Splinter Cell Blacklist and I'm just playing. Sometimes the screen flickers (i.e. white lines flicker across the screen) and then the screen will just go white or black but the background noise from the game can still be heard. This happens sometimes 5 minutes after playing or sometimes an hour or so. It doesn't only happen with this game, it happens with all others like Call of Duty MW3 or Far Cry 3. I can provide my minidump files if someone can tell what is going on. This has been going on for a long time even after I clean upgraded to Windows 8 from Windows 7. I upgraded and downgraded my graphics card drivers many times but it has not helped. I have also got into safe mode and then run a full scan with MalwareBytes and removed all the malware and then it worked fine for like an hour or so but that just could be completely malware unrelated. I also doubt that it is overheating related as I have a Corsair Hydro cooling on my CPU and there are dual fans on my graphics card. I also ran stress tests on my processor and graphics card and the CPU didn't freeze, however during the graphics stress test, the display froze but then returned to working again after the stress test program self exited.
My specs are:
i5 3570K @ 3.5GHz (not overclocked)
AMD HD7870 Sapphire
16GB RAM (4 sticks 4GB each all Corsair)
OCZ ModXtreme Pro 600W PSU