Any chance you could look at the Tyan Thunder K8WE BIOS.? There are no overclocking options whatsoever and the latest BIOS has just given support to the 7950GX2's but only one, add a second and there are IRQ errors which they claim are a fault at their end but haven't bothered to rectify anything yet.
Thanks very much in advance, I wish I could do what you do.
Here's a linky to the BIOS...
http://www.tyan.com/support/html/b_s2895.html