This message was posted on behalf of Intel Corporation
The only option is testing the processors in a working unit. I suggest you to try to get into the BIOS using only 1 processor at a time.
The memory controller is inside the processor, not any more in the board. The compatible memory with the Intel® Xeon® Processor E5-2690 v2 is:
DDR3 800/1066/1333/1600/1866 at 1.5V.
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Thanks for replying. I have since resolved the issue but here are more details for those that are interested.
The first issue was that the board failed to complete post, b2 (ASUS q-code) was always shown and this was even in a single CPU configuration with qualified DDR3 1600mhz non-ECC Corsair Vengeance RAM and no external GPU.
To resolve this first problem I bought a new motherboard (I had exhausted all possible options with the board and felt a new one had the most chance of resolving the issue).
With the new board dual CPU configuration still failed to post with q-code bc.
I had read some reports of people running in to this issue and that using ECC registered RAM resolved the problem. I can confirm that this also resolved the problem for me too.
It's a pity that even when you buy all the components as outlined on a qualified vendor list there is still no guarantee of everything working.
As the memory controller is on the CPU die I can only assume this is a processor oddity. I wonder if trying the old motherboard with the new RAM might now work correctly.
I've stress tested the system and everything seems stable.
Hope this helps others.