Games like Bioshock Infinite, Batman Arkham Origins and Farcry 3 all freeze after 15-20 mins of gameplay (except Bioshock Infinite, it freezes 5 seconds in on the 2K logo). I know it's not my graphics card because I took it out and opened up Bioshock Infinite but it froze on the 2K logo again. I checked my ram with memtest and no errors came up. I bought a new power supply (XFX PRO550 off of NCIX) and I reinstalled my graphics drivers but the results were the same. Im not sure what to try next.