I'm getting 860 Kh/s from my 2 270x's, and I paid less than $200 each. $194 x 2 = $388 for about 860 Kh/s. Not sure if it's feasible for you to run twice the cards, but it's a much better value. It's the main reason I got these instead of the 280x's. Plus they're a lot easier to find, but do with that what you will. Just wanted to throw it out there.