guys if i'm not mistaken there is a fps_max XXX setting.
"From Tweak3d.net - This is the new all-in-one framerate limiter CVAR for the new Half-Life. This affects LAN, Internet and Single player play modes. Due to the fact that setting this high will no longer create lag, I'd suggest that users set this to its maximum value of 100."
I have this setting in my CS config.cfg, I have mine capped at 72FPS. that maybe why your not seeing a higher fps.