question about my video card drivers?

[outbreak1331]

Well i came across a 560 gtx today it was going to replace my old card, i uninstalled the old drivers and installed the latest, now i get the same/less fps than before. can anyone help me understand what if causing this problem? if you need anything else let me know i'll try to reply asap.

G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ

Mushkin Enhanced 550250 580W ATX12V / EPS12V SLI Certified CrossFire Ready Modular Active PFC Power Supply

AMD Phenom X4 9650 Agena 2.3GHz Socket AM2+ 95W Quad-Core Processor HD9650WCGHBOX

ASRock A790GMH/128M AM3/AM2+/AM2 AMD 790GX HDMI Micro ATX AMD Motherboard

 

[Abstract Hero]

Well what was your old card? I'm gonna lean on maybe there's some bottlenecking.