I put a 6800GS AGP into my system with a Prescott 3.0E and unlocked the pipes which made it nearly (if not exactly) like the 6800GT. There was a huge difference in performance over my old FX5200. Of course that's an FX5200 so of course there would be a huge difference
. I'm not sure if anything is bottlenecking it but I would like to know how to find out if that's possible.