It occurred to me that Chris Kantarjiev wrote in gmane.os.netbsd.ports.x86-64:
> The 3.99.8 system knows the names of the chipsets, but the daily build iso 
> doesn't - even though the chipsets seem to be the same codes.

That's just a cosmetic thing. These names reside in the kernel, and result
in large tables. For a normal system this isn't that much of an issue, 
but in case of a installation kernel this space be put to better use.