"I found the topic with the same problem and cool article with more information. The reason of problem is a bootblock code, it can not be changed by BIOS update. Your motherboard's revision has old bootblock with date 1/30/2009, so you can't use Xeon 5600 Series in dual more.
P.S. Your BIOS has microcode for your SLBV3 with CPUID=206C2: version - 1A, date - 06/17/2013."
So my processors code is in the bios but the block just won't let it run in dual. Basically everything you said before, I'm just annoyed that the motherboard can run them but HP is holding it back. Time to sell a pair of 5650s😔
P.S. Your BIOS has microcode for your SLBV3 with CPUID=206C2: version - 1A, date - 06/17/2013."
So my processors code is in the bios but the block just won't let it run in dual. Basically everything you said before, I'm just annoyed that the motherboard can run them but HP is holding it back. Time to sell a pair of 5650s😔