Cheers guys.
It's frustrating as hell for me to attempt to separate the boards in terms of performance as the CPU is clearly limiting the boards on most occassions with the Baseclock running out of steam between the 200-205 mark. I have no doubts the revised D0 version would clock further in most cases. As all of the boards have the same NB and SB, and everything is run in a controlled environment performance is, and I guess should be comparable.
Hold on to your socks though because I sense P55 boards are just around the corner along with i5 CPU's which might bring some refreshement to the X58 domination.