>>536119292
I'm aware of how impossible the low-level emulation of Radeon or GeForce is, but it would be wonderful if a high-level emulation project for the GeForce 6600 GT emerged for both Windows XP and Mac OS X PPC.

Just look at what's been done;
RPCS3, which imitates? the RSX GPU (a modified GeForce 7800 GTX).
Xenia, which emulates the Xenos GPU (an AMD Z430 based on the R400 architecture) with its DirectX 9.0c superset.
Xemu, with its emulation of the NV2A GPU.
The recent efforts of the ShadPS4 project in emulating the AMD Liverpool GPU.
Hypervisor's obsolete virtual GPU adapters for legacy operating systems (e.g., VboxVGA, VMware SVGA II) and API wrappers (e.g., d3d8to9, D3D9On12, or even WineD3D/DXVK)

I know there are lots of hardware for PCs unlike those "static" console hardware but this kind of project (e.g., 6600GT emulation on high-level?) would teach us a ton about emulating GPUs from that era...