it wouldn't truly be "bottlenecking". the video card would no doubt be working to its potential, the lag you see is the system not being able to pickup the slack in processes like calculating physics and other things. but yes upgrading to an athlon 64 would help although i would get a 3200+ at least. also don't get a motherboard with a VIA chipset, look for an nFORCE 4 a.k.a NF4 chipset. by the way pci-e is short for pci-express. i believe pci-x is something completely different.
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