Hd 4830 mobile vs. 9600m gt

HD 4830 performs better but its really not fair to compare a Macbook pro with HP envy,because if you want to game then don't consider using macs for gaming

well i would use load windows 7 on it. Also how many frames per second would i get with an hd 4830 on crysis, i just need decent frames because i already have a good desktop with 2 9800 gtx+'s. will the hp envy overheat

I don't know the exact fps,but i think u can play it on medium settings with a good FPS.
Check this link :
http://www.notebookcheck.net/AMD-ATI-Mobility-Radeon-HD...