I read that article, and i wasn't totally sure, since my case has quite a bit of extras that draw power. But if 700watts is enough, than mine should do fine.
Also would you suggest these cards (6870) in crossfire, or a single gtx 570.
I have heard about some issues with crossfire, and I was wondering are those fixed, do they apply to crossfire in general, or in most cases it seems to occur with eyefinity setups with multiple monitors. I plan to run 2 monitors only.