The ASUS Z8NA-D6C is a very interesting motherboard. It has some great potential, but I think for many graphics professionals the D6C will not be the choice; they will go for the D6 with its built in LSI raid controller or an add-in board.
However, as with most dual CPU (and multi-core) systems, you will run into applications that do not know how to use the second CPU or to get all of the cores available to work properly. We were impressed with the way the board handled games as well as the lower power usage (that was a very pleasant surprise). Although we did not touch on the way it would handle as a Linux or Windows server, we can see where the support is there for this role. Features like NUMA support, caching profiles, and remote management all combine to make this a very good product for the server/workstation market. Plus, when you consider the price tag of only $300.00 at NewEgg.com you are not getting a bad deal at all.
We will try to revisit the Z8NA-D6C with a faster pair of CPUs and more RAM in the near future (as well as a couple of additional workstation related applications), but for now we can tell you that the Z8NA-D6C is a very capable board for either a workstation or server that needs dual CPUs in a small package.