You have GeForce 6600, it means that your video card belongs to GeForce 6 family.
Yes, GeForce was a family of video cards released by NVidia. There were 4 GeForce families i think, each with their own ranges of models (GeForce 2 MX for example). Now NVidia uses notation similar to ATi's system.
Lets say that first 5 would be: GeForce GTX 285M GeForce GTX 280M Quadro FX 3700M GeForce 9800M GTX GeForce GTX 260M
You can download drivers for GeForce video cards for free from NVIDIA's support site.
first of all, bad grammar! Yes, geforce 256 mb supports pixel shader 2.0. I'm talking about nVidia Geforce g 105m video card
Series 7
the 8400 is the better card
Research has shown that the GeForce 7300 video card has been discontinued and is therefore somewhat difficult to find. One can purchase this video card from sites such as Amazon and eBay.
No
The nvidia geforce FX series and 6000 series & up all have support for at least 2.0. this is true but not for all geforce series. you would have to have a 2000 to 3000 power on your nvidia grapghic card.
Minimum: GeForce 7800 with 256MB and support for Pixel Shader 3.0, or AMD equivalent Recommended: GeForce 8800GT 512MB or AMD equivalent
The best performance: ASUS ROG ARES II Radeon HD 7990 The Best for Performance and price: GeForce GTX 680
nvidea geforce 5200 or higher