I just built a new system and I know my 400w supply isn't big enough. I'm running an ASUS P6T WS Pro, 920 2.66GHz overclocked to 4Ghz, 6G DDR3 G.Skill, GeForce8400GS card, Titan 6 pipe sink and fan and four 80mm case fans (2in, 2out). Temps are a little high at idle (50C) and now I'm starting to get the dreaded "Overclocking Failed" message on init bootup. I've only had it together for 4 days and haven't run it for longer than 4-6 at a time. Is 750W going to be enough to power this sufficiently?