Does anyone have any recommendations / experience / opinions on a good dual CPU motherboard. Looking to build a new rig for gaming and physics simulation so need as much grunt as possible!
Not that I am aware of. There you would have to get a server motherboard an a pair of opteron cpus. A slightly cheaper option would be going the slightly older route:
This would be a bit cheaper while providing a total of 12 cores/24 threads and the ability to overclock. The newer xeons that I originally posted are all locked I believe. Overclocking these allows you to get the cheapest models and simply overclock to obtain extra performance while saving a couple thousand. AMD does not really have anything comparable as far as I know for non server use. The amount of memory appears to be halved though at only 48gb for the older sr-2 versus the newer sr-x allowing for 96gb.
Any reason you wanted to specifically go AMD? If cost is your concern, then getting a dual cpu setup is probably not your answer.