Well that all looks pretty good, 2 working motherboards and a post card. Dunno why it gives the wrong CPU type, the only jumpers I can see missing are J2,8,9, but they're to do with the VLB slots. Do you know which version of the BIOS you're running? Maybe it's an earlier one that doesn't know about AMD DX4 (I think the Intel DX4 was a bit earlier).
I notice in the manual I'm looking at that a couple of things are only officially supported on the Rev 8 boards, like Write Back cache on the missing JP30, so that SV8B you have might not work. OTOH, the pads for JP30 are there on the board, so there's a small chance that fitting a couple of jumper pins and installing the most recent BIOS might make it work.