PSU should be fine for one 4870X2 and the rest of your rig, but for dual 4870X2 cards i would want something more powerfull like the Tagan PipeRock TG900-BZ 900w Modular BZ Series PSU
http://www.overclockers.co.uk/showp... PipeRock TG900-BZ 900w Modular BZ Series PSU
Though it costs more for the PSU this cost would be easily made up if you got the Intel Core 2 Duo E8500 LGA775 'Wolfdale' 3.16GHz (1333FSB) CPU instead of the E8600. Theyre practically the same speed and yet its a £70 saving. There is no way i would buy the overpriced E8600.