If you have any motherboards that will not PXE boot, then use the Folding CD Generator to make a CD for them, they will still backup their work to the server setup as per the Diskless Folding HOWTO. The Folding USB Stick saves the WU directly on the stick rather than to the server.

If you have any further questions, hit the "TR Distributed Computing Effort" forum at The Tech Report and ask "notfred".