well im not a laptop person but Im sure 99% of the laptops arn't upgradable on graphics cards. If you get a Geforce 2 it mit even be worse than your current SIS onboard
if your geforce is an actual desktop card.. then don't bother, that thing isn't going to work on a laptop. Upgrading laptops is very impractical, usually only hard drives, ram, and CPUs can be upgraded.. the rest, well, doesn't usually work out.
the minimum specs required is a geforce, it runs perfectly on my desktop, i know exactly which card i need for the laptop. I was just wondering if it was possible to switch cards out