Drop the 24bit idea. NVIDIA and ATI don't support it anymore since quite some time.
I would go for 32bit (NV and ATI work internally on 32bit anyway and downscale the output to 16bit) and fallback to 16 if needed. IE: Use graphicsdepth 0 which does exactly that :-)
I would go for 32bit (NV and ATI work internally on 32bit anyway and downscale the output to 16bit) and fallback to 16 if needed. IE: Use graphicsdepth 0 which does exactly that :-)