So PSU's aren't my specialty but, my new rig which i just replaced the mobo, video card, and ram is turning off every once in a while on its' own. I've narrowed it down to my 6 year old power supply. Its a 750 watt thermal take tough power with 4 12v rails at 18 amps each. My mobo is a 768 with a gtx 570, and a core i5 2500k. Should I buy a new power supply? If so, can someone research a good power supply thats decent and is NOT more then I need (preferably thermal take as the connectors will be similar to what I have). Thanks!!