"Direct3D backwards compatibility has always been “you get what your graphics cards run”. For example, Crysis may be a Direct3D 10 game, but if you only have a Direct3D 9-level graphics card, it might only make your jaws open instead of hitting the floor. But that’s all going to change comes Windows 7.

Simply put, in Windows 7, you will experience the same graphics fidelity and detail whether you have a Direct3D 9-level graphics card or even no graphics card. The magic fairy dust which makes this possible is called Direct3D 10Level9 and Direct3D WARP10 respectively."