Hey guys. Ive got a dual 1.8GHz G5 Power Mac (June 2004) with the Radeon 9600 XT. I like to play a few games here and there (Halo, UT2004, Doom 3, Quake 4, Cal Of Duty 2) and was wondering if it was worth it to upgrade to a NVIDIA Geforce 6800 Ultra. I wouldn't have considered this normally, but I found a card going for ~$135. My concern is that my CPU speed is going to be more of a bottleneck here - UT2004 and the Doom 3 engined games I hear are quite CPU bound, and my own observations seem to confirm this (they all max out a single CPU.) All the benchmarks I can find with the Mac 6800 Ultra have the card stuffed into a 2.5GHz or faster computer, so not too relevant for me. Anybody got experience here? Thanks!