The G Police demo supports a wide variety of 3d hardware. 
The game has been tested and works on the following cards:

S3 Virge VX
ATI 3D Rage II
nVidia RIVA 128
Matrox Mystique
3dfx Voodoo and Rush

The game may also work on other D3D capable boards, but beware of
glitches.

In the event of problems:

We also provide an 8-bit software rendered version if your 
hardware isn't supported.

Please note that you must have the most current version of the
drivers for your video card before G Police will run properly.

Please contact to your board vendor for information on where to
get the latest drivers.