...time to get back to some benching after a few problems... got a replacement RIVE as my original RIVE had turned into a sociopath, killing one non-oc'ed SB Extreme chip (replaced under warranty) and trying to murder an Ivy-E Extreme and a G.Skill RAM stick - it just didn't like to be powered down for longer periods and start up in temps below 20 c, don't ask me why.
Alas, now I have a new RIVE which is much better behaved, and it joins the RIVE BE...and this board below which is really destined for a more commercial setup (after some 3 and 4 GPU 16x16x16x / 16x benching
This X79 WS-E board is rock solid (far more so than the RIVE BE), oc's very well and currently has 32GB of memory running at DDR3 2400 to 2600 w/ SB-E (less happy with Ivy-E though; it works but seems to need another BIOS upgrade for that)
...some may find this sacrilege, but after some extensive tests w/ various boards using the same CPUs, RAM, SSDs etc, I find that the RIVE is actually better than the RIVE Black, consistently requiring a bit less v-core per given chip out of a pool of 5 CPUs, and also offering extra stable strap settings which won't work in the RIVE Black for the same CPU > go figure. As to memory performance, Ivy-E hits the same frequencies with RIVE as it does w/ RIVE BE on my setups.
Compared to RIVE, RIVE BE also lacks a bit re EZ plug power issues That said, the RIVE BE is nevertheless a decent benching board, and the new home for a 4930K (and may be 4960 ES once Haswell-E is out) for single and dual card benching. As long as it doesn't turn into a sociopath...