from
http://www.openbsd.org/i386.html :
"Everything that is a clone of the 486 or up should work fine."
The issue is almost never the CPU itself, the issue is the surrounding
support chips and firmware. There is much more to a computer than its
processor.
Asking "Does OpenBSD support my new processor" is usually missing the
point. Ask if it supports your new COMPUTER. Better yet, get yourself
one of those "credit-card" CDR blanks, drop cd42.iso on it, and carry
it with you and find out, or on modern computers (duh, which we are
talking about, right?), grab a USB flash drive, and put a test install
on that, and you can boot the entire OS, test X, NIC, whatever, and
grab a dmesg, drop it on "disk" and analyze it later.
Nick.