I just upgraded my x600 pro pci-e (yuck!) to an x1950pro 512mb, and i was just wondering whether or not my athlon 64 3500+ 2.2ghz processor will be holding it back. I'm stuck with a socket 939 mobo and I know that 939 cpus are slowly disappearing- but I'm not sure whether an upgrade will yield that much of a performance boost with that GPU. Either way, I am hoping to scratch by for another year or two until I can justify building a new rig from the ground up. So what do you guys think?