Where I find it?
I've got a old PC with that I manage to install Windows 7, but the on-board vga is incompatible with Windows 7. Then I miss the transparency and another Windows Aero effects. Additionally, the games runs very slow.
I'm sure that installing a very basic GPU (it's AGP slot) the Windows and games will run "acceptable". I've got the NVDIA Compatible GPU List here: http://www.nvidia.com/object/io_1241025430517.HTML, I know that I can get a Geforce 6100/6150, but I don't known the minimal equivalent/compatible from ATI.
