That power supply is 1 rail vs 2 rails. It is cheaper to build but 2 rails are better.The processor has basically its very own power interface that is separated from all other power consuming devices.
http://chipcooler.amazonwebstore.com/Coolmax-700W-Nvidia-Certified-Sli-Modular/A/B000G702RI.htm
looks like this has 3 rails
Please please please understand what you're posting about.
I copied this from the Internet because it's well stated and I didn't want to have to type all this out:
A large, single 12-volt rail (without a 240VA limit) can transfer 100% of the 12-volt output from the PSU to the computer, while a multi-rail 12-volt design has distribution losses of up to 30% of the power supply's rating. Those losses occur because power literally gets "trapped" on under-utilized rails. For example, if the 12-volt rail that powers the CPU is rated for 17 amps and the CPU only uses 7A, the remaining 10A is unusable, since it is isolated from the rest of the system.
Since the maximum current from any one 12-volt rail of a multiple-rail PSU is limited to 20 amps (240VA / 12 volts = 20 amps), PCs with high-performance components that draw over 20 amps from the same rail are subject to over-current shutdowns. With power requirements for multiple processors and graphics cards continuing to grow, the multiple-rail design, with its 240VA limit per rail, is basically obsolete.
Obsolete might be a little strong but you get the idea. This is the reason I and so many others on these BBs reccomend PC Power and Cooling as they all use large single rails.
One more thing; if you have a 20 amp rail running at 80% efficiency you're only getting 16 amps off that rail which may not be enough to power a high end video card.
[EDIT] Infowars, it sounds like you're not up to building one yourself and want to buy pre-built. Is that correct? If so is there any particular reason that you want to buy it at Circuit City vs. Best Buy, Dell or anywhere else?
The best bang for the buck would be building it yourself. Either way, you're not going to get much for $500 but let us know and we'll help as much as possible.
