Just an information, the dedicated graphic card for notebook not necessary is a piece of external card. As for myself, i have a dell inspiron 1420, with Nvidia 8400GS GC, however, the dell technician open up my laptop before and i saw that the GC are soldered on the motherboard. So i think it is not possible to change the GC later on i think. But as for the M1730 SLi and the 1520, i not very sure but i think it might happen to be the same situation, which is soldered on board.

My 9400 my big bro wanna angkat go out study already.. so i no lappy use.. so plan get another lappy which can play games.. but dunno 8600GT have better performance then 7900GS like my 9400 or not.,.

and the 8800GTS is coz my old gc really cant use oredy then buy 1..