$100 for the 6600GT is a good deal, I would get that if you have an AGP slot before I bought any of the dated Ati cards(9550, 9600, 9700 or 9800). Its not the fastest card and your CPU is gonna bottleneck the 6600GT's performance however you should be able to run AFPD or Reflex at several hundred frames per second with it..
I have a 6800GT and I am not thrilled with G3's performance.
ORIGINAL: Invertedflyby
My Coworker bought a new card for a game he wants to play but then found out his computer doesn't have an AGP slot so he said he would sell the card to me for $100. It's a "XFX GeForce 660GT 128MB DDR3 AGP Dual DVI&TV P450-8529". Would that run any of the sims really well? I was going to buy a better one with 256mb but this is alot cheaper. I'm still up in the air but starting to lean a little towards AFPD or Reflex XTR.