PowerEdge: R740 - Multiple Memories Reports Multibit Error (MBE) After Adding Memory

2021-10-29 06:41:29	Multi-bit memory errors detected on a memory device at location(s) DIMM_B12.
2021-10-29 06:41:29	Multi-bit memory errors detected on a memory device at location(s) DIMM_B6.
2021-10-29 06:41:29	Multi-bit memory errors detected on a memory device at location(s) DIMM_B11.
2021-10-29 06:41:29	Multi-bit memory errors detected on a memory device at location(s) DIMM_B5.
2021-10-29 06:41:28	Multi-bit memory errors detected on a memory device at location(s) DIMM_B10.
2021-10-29 06:41:28	Multi-bit memory errors detected on a memory device at location(s) DIMM_B4.
2021-10-29 06:41:28	Multi-bit memory errors detected on a memory device at location(s) DIMM_B9.
2021-10-29 06:41:27	Multi-bit memory errors detected on a memory device at location(s) DIMM_B3.
2021-10-29 06:41:27	Multi-bit memory errors detected on a memory device at location(s) DIMM_B8.
2021-10-29 06:41:27	Multi-bit memory errors detected on a memory device at location(s) DIMM_B2.

Check the TSR log, while the MBE error is reported in the memory, there is also a UEFI0355 error. The information is as follows.

2021-10-29 19:41:41 496 UEFI0355 All the NVDIMMs are disabled because the value of memory capacity of all the installed NVDIMMs has exceeded the maximum value supported by the processor.

Check again the memory size that the used CPU is supported.

The CPU used is a Xeon Gold 5218 X2.
A single CPU supports a 1 TB memory size.

Under this configuration, 2 CPUs can support up to 2 TB of memory.

The memory capacity of the server has exceeded the support range of the CPU.

Reduce the memory capacity to 2 TB.

Install the memory according to the system memory guidelines in the installation and service manual.

https://dl.dell.com/content/manual31379452-dell-poweredge-r740-installation-and-service-manual.pdf?language=en-us