YOu go to a shop and just like Intel inside , its written NVIdia Inside. What does it mean and what is its implications. The implications are as follows.
7900 gx2 Adapter High end direct x9.0 compatible
8500GT low end directx10 compatible
8600 GT(S) high end directx 10 compatible
8800 GTS Best for gaming and video slightly expensive
NVIdia and ATI based video adapter have onboard memory and can be used for better gamimg and video experince. Various software requires compatibility with Direct x 9 , 9.0c,10 et al. Check out before buying computer.