Here is my system spec:
Case: COOLER MASTER HAF 932 Advanced RC-932-KKN5-GP ATX Full Tower
CPU: Intel Core i5-2500K
Mobo: ASRock Z68 Extreme3 Gen3
RAM: G.Skill Ripjaws X Series 2x4GB DDR3 1600MHz
HDD: Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB Cache
SDD: Crucial M4 CT128M4SSD2CCA 2.5" 128GB SATA III
PSU: CORSAIR Professional Series HX750 750W
I might SLI in the future, so is 750W enough to power 2 GTX 550 Ti??
Absolutely.....it can even run 2GTX 570....dnt worry..just go for it..........i think u can go for a better card..go for 680GTX...cz someday u might thnk of changing ur disp....bt i reckon 550Ti is more than enough for ur 1440X900......
U look at my specs(just like a son in front of urs)...I play Battlefield 3 at ultra at 1080p......