GeForce 8600 GS is a middle-class GFX based on the 80nm variant of the first-shader unified architecture.
It's based on the G84 Core and offers 16 Shader Processing Units, 8 TMUs and 8 ROPs, on a 128-bit memory interface of DDR2. The central unit runs at 540MHz and the memory clock operates at 400MHz. It will consume no more than 47 Watt.
It's therefore more comparable to GeForce 8500 GT and pales in comparison with GeForce 8600 GT.
This GPU is only suited for a 1024x768 (or less) resolution. Most of today's games will only run at low settings and extremely demanding games might not run at all. DirectX 11 based games aren't supported and its performance will decrease drastically, as the resolution increases.