Just remember, this is a development snapshot. It is not complete. It is just where we are, at the moment. We still have quite a bit of work left to do.
The NVidia 9600GTX, with 512MB of video RAM, is our target performance card for this release. Shader Model 3.0 will be the lowest shader model supported. If your video card doe snot support that, it will not run the new update, when it is released.