I try to stay out of these discusions about which card is better, but come off it!!! since an x1600 512mb is really 2 x800 256mb's how could anyone think a 128mb 6600gt would be better?? And there's nothing slow about the cards ram.
128-bit 4-channel DDR/DDR2/GDDR3 memory interface
I am nvidia all the way now, but I like facts not fiction. Everyone seems to forget that the x850xt/pe spanked the 6800ultra hand's down. (people forget because the geforce 7's came out shortly after the 850's) Ok now that I got that off my chest and all joking aside, lol do not get a 128mb card. try playing BF2 with that.
Let the flamming begin,,, lol