It occurred to me that Rick Kelly wrote in gmane.os.netbsd.ports.x86-64:
> Andy Ruhl said:
>
>>Can't comment on that hardware if that's what you're looking for.
>
> My initial concern is the nforce4 chipset on the motherboard, and whether
> this will cause problems installing. I do see nforce4 support in the
> source tree, but I can't find any recent success or otherwise data on
> the web or in the mailing list archives.

I'm running an nForce4 board. On-board ethernet isn't working, but most of
the rest is.