Thanks, Ray and Shux...
I checked the supported CPU page for the AX6BC and the highest speed I saw there was 800. Guess I should have also checked the BIOS page before posting my question...
[EDIT] - This is a perfect example of why DC is the best forum around.

I posted that question over in the MB forum at around 4:00 PM and it has yet to get a response. I posted it here and 1/2 hour later I've got the answer.
