One 7990 is bad, 2 would be horrible, don't waste your time. Go with SLI 780's if you have that kind of money, it will be faster in the real world and free from headaches.
One 7990 is bad, 2 would be horrible, don't waste your time. Go with SLI 780's if you have that kind of money, it will be faster in the real world and free from headaches.
Off topic don't you think? He specifically asked about a PSU not advice on what video card to buy.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139039
CORSAIR AX1200i 1200W Digital ATX12V v2.31 and EPS 2.92 SLI Ready CrossFire Ready 80 PLUS PLATINUM Certified Full Modular Active PFC Power Supply
More info below :
http://www.realhardtechx.com/index_archivos/Page362.htm