Z9PE-D8 WS motherboard won't boot with two CPUs, but it gets half-way there...?

donkom

Honorable
Sep 21, 2013
3
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10,510
Hello everyone,

I know that a few people have had issues getting a Z9PE-D8 WS board to post, but I'm at a loss to explain this one.

CPUs: 2x Xeon E5 2697v2
BIOS: 5103 (latest, ordered direct from ASUS so board would boot with these new CPUs)
RAM: Corsair Dominator Platinum 64GB kit (8x8) 2133mhz
PSU: Corsair AX1200i (I also tried an HX1000w, to no avail)

Either of the CPUs in socket #1 boots just fine. As soon as a CPU is in socket #2, the motherboard will generate a q-code of "bc". This is refined in the manual as "reserved for future AMI codes". So helpful!

Every conceivable combination of RAM has been tried. It works perfectly fine, fully populated on one socket, nothing for socket #2.

Some other people suggested that it could be a short caused by unused risers on the case. No extra risers, no shorts.

All peripherals and extra connections are removed, save for the CPU fan ports and all necessary power connections.

When motherboard reaches "bc" q-code, it hangs, requiring a 5-second hold of the power button to turn off.

So... any ideas? Bad board? I'd really rather not have to disassemble this rig, it's watercooled and a pain in the neck to do.
 
Solution
I can confirm that the issue with Z9PE-D16 and Dual Intel Xeon E5-2620 v2 will resolve with using ECC-dimms.

Works perfectly without ECC if you're just using one CPU, but with two CPUs the b6-error show on the Q-code and it won't boot. Switching to ECC solves the problem. BTW, this is not the issue with v1 of the CPU. It should work regardless of ECC.

donkom

Honorable
Sep 21, 2013
3
0
10,510
Thanks Alexoiu, I'll likely be following up with ASUS support tomorrow.

Calvin7, why would you make that suggestion? These chips support faster RAM, and up to 1.5TB of RAM per CPU as a logical limit (of course, the motherboard is far less at 256GB). I will eventually be upgrading to 128GB of ECC 1866mhz RAM when it becomes available. The 10 and 12-core 2600v2 chips have a dfferent memory controller design, so it'll be interesting to see how it all works out.
 

Craig93

Honorable
Jan 5, 2014
1
0
10,510


Did you reach a verdict with running the dual cpu's?
 

donkom

Honorable
Sep 21, 2013
3
0
10,510


Yes - it has been confirmed with another person and the same setup - dual CPU configurations have issues with non-ECC DDR3 memory. Switching to ECC RAM allows the system to boot.

 

kennethdammyr

Reputable
Feb 28, 2014
1
0
4,520
I can confirm that the issue with Z9PE-D16 and Dual Intel Xeon E5-2620 v2 will resolve with using ECC-dimms.

Works perfectly without ECC if you're just using one CPU, but with two CPUs the b6-error show on the Q-code and it won't boot. Switching to ECC solves the problem. BTW, this is not the issue with v1 of the CPU. It should work regardless of ECC.
 
Solution