My entire computer has started freezing completely when I play games for an hour or more. I recently upgraded my CPU from an i5 4590 to an i7 4790k. My specs are; MSI B85-G43, 16gb ddr3 Kingston crucial 1600mhz, GTX 980ti Zotac AMP Extreme, 500w EVGA PSU, i7 4790k stock settings, Deepcool captain 240ex cooler. I have also recently done a fresh install to try and fix my issue.