> 
> 
> Does anyone have a working x86 NetBSD box with the following:
> 
> - VIA KT133A motherboard
> - Thunderbird "C" 133/266fsb CPU

should work but better not buy VIA-based things

> The hardware support page doesn't seem to contain specifics regarding
> possible compatability issues, and I just wanted to be certain before
> investing in the associated equipment.
> 
> One more thing, does gcc support any AMD optimizations?
i think no. 
use -mcpu=pentiumpro -march=pentiumpro -O2