The Gigabyte board is particularly interesting because it is the Slot A board that the 7IXE4 Socket A board is based on. It seems like crossflashing the bioses between these boards won't be a problem which is nice because i found a (working) modded bios for the 7IXE4 that has CPU support for Palomino, Thoroughbred and Barton. It would be interesting to try this bios on the 7IXE Slot A board and see if it would run with a Barton CPU. If the adapter actually works of course...
Crossflashing is indeed possible. I have both boards (GA-7IX, SlotA and GA-7IXE4, SocketA) and tested it 2 weeks ago with unmodified bios roms. The Socket A board runs pretty fine with the Slot A stock bios. The board was able to boot with all Athlons and Durons, also with Palominos, Thoroughbred and Barton. The Slot A motherboard also ran with the wrong bios, but there was an immediate freeze in the bios under "Hardware Monitor Setup".