Your CPU would bottleneck a bit those, my 5770 is bottlenecked by my C2D E7500 2.93 Ghz... And your PSU wont be enough for either of those, probable you should try with a 5670 or 5570 if you're not upgrading that PSU, if you are I strongly recommend a good brand 450w-550w power supply for either of those cards, Antec or Corsair are your best choices but you can always go with other decent brands like cooler master or raidmax or thermaltake