Sorry, I was wrong on the card.
Looking at the OP's motherboard, it's only a 775, so core2duo, core2quad maximum cpu, so any decent GPU is probably going to top out fine and their CPU is going to bottleneck at some point, especially if it's a dual core in games like 64player BF3.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
Sump Pimp #2
My Tanks and my shrimps