for CSS go:
options/keyboard/advanced/console
then press "~" to bring up the console then type in "net_graph 1" and wa-la fps and ping and such will show at bottom right hand corner. yes i have a 6600gt and i get around 80fps most of the time with my set-up on CSS. actually 30fps still isnt all that great, neither is 40, for best playing you want 55+ then its as smooth as glass