Originally Posted by AlphaNerd
yeah, I am looking for a power supply for a single gtx 580 system. I will be overclocking the cpu and the msi lightning I mentioned earler comes overclocked from the factory. So, I guess I am getting an over all concensis on a 650 watt unit. I appreciate all the feedback
Particularly if you're not overclocking the GTX 580 more than the factory OC, I'd feel comfortable with an overclocked i7-2600k and GTX 580 on a good 520W power supply. 650W is okay but unnecessary.
Check the below (note where it says system power consumption and where it doesn't, and keep in mind that you won't reach full synthetic loads in any real usage scenario):
A decent power supply would be an Antec High Current Gamer 520W (Seasonic S12II Bronze build) for $60:
Granted, a lot of the higher-quality 650W units are better than the HCG 520W in ways other than having a higher wattage. They're more expensive from having superior, more costly designs that perform better.