What is the difference between my sis672 to other video cards? Answer Please!?

I've install sim's 3 in my laptop and the game is to slow because of my video card.

here are my system specs:

-vista

-intel celeron 2.20GHz

-2gig of ram

-sis mirage 3 graphics(672 series) 376mb|||Sis graphics is crap! Looks like time to get a good laptop