X10SRL-F bad RAM slot or defective CPU?

[hardstep]

You can have a system that boots most of the way, but then throws a memory error due to a mis-seated CPU (ask me how I know ).

I doubt the socket is the problem because I have same error for CPU1 ( slot A1) and CPU2 (slot E2).
memory is memtesting now. ordered E5-2603v3 and 8GB 1rx4 2133 ECC REG

 

[hardstep]

SuperMicro X10DRi, 2* E5-2680v4, 4* 64GB Samsung DDR4 64GB LRDIMM 2400 1.2V 4Rx4 M386A8K40BM1-CRC4Q.
systems does not boot and "Failing DIMM: DIMM location (correctable memory component found)" on the screen.
MB is not in case(no shorts).
All contacts at DIMMs and CPUs are cleaned with alcohol.
This CPUs and DIMMs works fine in another MB.
I just bought this used SuperMicro MB and dont know what BIOS version.
What should I check next?

With E5-2680v4 + 8GB DIMM sytem showed same error. With E5-2620v3 + 64GB LRDIMM system started normally. No need to buy 8GB DIMM. The BIOS version was 1.1 with Sangfor logo. This CPU allowed me to update BIOS to v 3.4a. After BIOS update E5-2680v4 + 4*64 GB LRDIMM works fine with 1CPU and 2CPU configuration.
thanks everyone for help.