to be honest, if you're gonna run such a priced PC, i'd go with something better than a 80+ white, go bronze at least, and seeing how power requirements for tech are only going down, you deffinetly should have enough, though if you want to put in a 750 Watt then its deffinetly not going to hurt in any way, i put those in my smallest builds since you can get them at a not too high price anyway.. i'm rambling