yes everything looks fine to me,even 500w psu should be good enough,remember that the 5770 is a better card than the GTS250 1GB DDR3 due to it having 1gb ddr5 memory,click on my youtube link to see how a 5770 card runs on a ex58 mb,i can play all games on highest settings,if the gts is under warranty then you can rma it for a replacement,it happens,sometimes
you just get a faulty unit