So, I'm experiencing an odd problem. I found settings that are stable for 5 instances of IBT at maximum memory usage (x64) and work fine when running HyperPi 32M using 8 cores. However, some games (GTA 4 and Left 4 Dead 2 in particular) crash after about 30 seconds. Does anyone have any idea what might be causing this? Just for clarification, the games crash to desktop - the machine does not lock or BSOD. I get no other error message other than the standard "such-and-such has stopped responding yadda yadda." The machine works fine after that other than looping audio.