Also, you need to be prepared to deal with what is probably the buggiest port to PC ever.
And I hope your laptop has some serious gonads, because even my 955B/GTX460SC+/8gb DDR3 half-decent rig that plays BF3 on Ultra at 50+ frames/sec can barely squeeze 30 frames/sec out of GTA4 on medium settings...
The game is a train wreck.