Thinking about Buying Starcraft 2. Need some help with PC

[Vectorferret]

It's listed at 86W, they tend to use a little bit less. I ran a quad core CPU, 4 HDD's and the 5750 on a 400W. Just don't overclock it. I'd estimate your CPU at no more than 100W, so you still have plenty (by my semi guesswork).