LOL,even I have a 9500gt! but I think it's still good enough to play those "not so demanding" games.......NFS,dead space. For me it played crysis on high settings without any lag. And yes, that combination of i7 and 9500gt is quite odd.You could upgrade to a gtx460 or higher
Try to update your driver, should be under "Updates" in your startup menu, when I updated my driver my games sped up in FPS alot.