LOL Awesome.Just ballparking but I know that i7 processor draws up to 200W under load (Ivy Bridge is hungry) and the GPU will draw up to 200W or more so that brings you already to 400W... probably won't run into problems but obviously people like excalibur and myself go for a bit of extra futureproofing so we can get through a few more upgrade cycles on mainboard components before needing to step up to a larger PSU again.
@excalibur: VRMs on the mobo and GPU help further smooth out power ripples, enough to protect the components at least. 80 Plus is just an efficiency rating that hasn't much to do with whether a PSU provides stable power or not, just how efficiently it converts power from a wall outlet into available power to the components. Most PSUs nowadays have an 80 Plus Bronze rating at least, 80 Plus Silver is only 3% more efficient.
A 750W PSU @ 100% load with an 80 Plus Bronze rating therefore draws 915W from the wall, while a 750W PSU with an 80 Plus Silver rating at the same load draws only 882W; a 33W difference. 15W is about how much a CFL bulb draws, so basically the difference is only as small as having two CFLs lit whenever you use the computer. The difference is of course a lot smaller when dealing with actual load voltages, which usually don't go above 400W in modern systems. You may already know this I just did the math for a bit of fun on a quiet Sunday night :nerd:
One quick suggestion, if I may:
- don't buy that processor. Stick with the i5-2500K. It has the same amount of processor cache, is quad core, and easily (I mean really easily) clocks to way beyond 3.4Ghz. The one you're looking at is just higher-priced because it's clocked from the factory when in fact it is the same exact processor. Save a bit of money