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i checked the texture formats a gf4 supports with the directx caps viewer.
maybe the following list of supported uv-offset formats is interesting? what does d3dusage_dmap mean? are there less nos with ati cards?
Are you using the Caps Viewer for DX8 or DX9? If your using the DX9 one, you maybe getting invalid results.
d3dusage_dmap has to do with the displacement mapping in dx9.
As to the ATI ones, my laptop has a 9600, and it shows all the below formats. I did notice that for my GeForce4 Ti 4200, i dont see D3DFMT_V8U8 for 16 bit fullscreen. Not sure if that is an issue or not.
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nvidia geforce4 ti 4200 -> d3d device types -> hal -> adapter formats -> d3dfmt_x8r8g8b8 (fullscreen) -> texture formats
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texture formats 0 (plain) d3dusage_rendertarget d3dusage_autogenmipmap d3dusage_dmap
...
D3DFMT_V8U8 yes no no no
D3DFMT_L6V5U5 yes no no no
D3DFMT_X8L8V8U8 yes no no no
D3DFMT_Q8W8V8U8 yes no no no
...
