Hmmmmm, idk, in my motherboard manual says it recommends at least a 450w PSU. I'm not sure if that's just ASUS covering their behinds, or if there is some truth behind that...
not all PSU are built with the same quality and there is no regulation on what you can put on a PSU. so i can take a 300w PSU and stick a 450w sticker on it and sell it as such. asus needs to recommend for bottom of the barrel PSU, the corsair you selected offers solid performance for a budget unit.
with the AMD 7770, the following unit did not break 250w total power under a stress test
Core i7 Test System Specs
- Intel Core i7-3960X Extreme Edition (3.30GHz)
- x4 2GB G.Skill DDR3-1600(CAS 8-8-8-20)
- Gigabyte G1.Assassin2 (Intel X79)