I have just started overclocking my CPU. I have the voltage at 1.4v and the clock at 4.3ghz. When I run Intel burn test it is stable and runs at around 50-55 degrees Celsius. However, when I turn up my clock to 4.4ghz and I try and run Intel burn test again, my computer freezes and I must restart. From what I have heard, I should be getting around 4.5ghz at 1.4v easily with a 212 evo push/pull. Any suggestions on what might be going wrong? My motherboard is an ASRock Extreme3 990fx. Thanks