It really depends on the psu and how hard you run your unit for how long, at least to a degree. There is a psu formula to figure out what's required to run a system. Myself, I like this to be no more than 75% of my overall rated power supply. The reason is power consumption when close to the limit is harder on the unit regardless of the make, it's noisier, and runs hotter. This is also one of the most crucial components in your entire system. There are some people who will strongly disagree, but for me, to err on the safe side is preferable. That said, I like to go a slight bit overboard. Hence I will spend a bit more for a great quality psu, such as Corsair. In the end it's up to you as to how much you're comfortable spending on this item. A unit will only draw what it needs, so a bit bigger than necessary will future proof you for future builds, or going xfire/sli.
|Good luck and enjoy.
