What Psu should I buy?
Since you’re considering the possibility of two 5770’s in the future, don’t waste your money on one now for 1 card and then another for 2 cards later, buy a larger psu now that will accomidate any future upgrades. The bare minimum that you would need for two 5770’s would be a 600W psu. Power requirements for HD5770 – System Requirements 450 Watt or greater power supply with one 75W 6-pin PCI Express power connectors recommended (600 Watt and two 6-pin connectors for ATI CrossFireX technology in dual mode) I prefer a little headroom when buying a psu, so I would get a quality 650W or larger psu. Since Corsair is the only brand I’ll buy, I would recommend either the TX650 http://www.newegg.com/Product/Product.as… or if you prefer modular for cable management, the HX650 http://www.newegg.com/Product/Product.as