My pc with fx 6300 overclocked to 4.0 ghz with the psu Corsair VS 550 and MB GIGABYTE GA-78LMT-S2 hangs/freezes after 20 mins of prime 95 every time. However, no errors are displayed on prime 95. What is the issue here? The aftermarket cooler that I use is Coolermaster Hyper TX3 Evo.