If your running a game, let alone 2 instances of it your gonna be maxed out 100%. I don't know of any ways to throttle it back, but it everyone else is crashing I don't think it's your rig or heat. Sounds like shoddy programming. CPU's can run at 100% for extended periods of time with no harm, the heatsink is made to take it. Big thing is ask the guy that stays up the longest what is diffrent about his rig. May be running a diffrent version of directX. Try to mimic as many settings as you can.