Hi, I’d say we try swapping the A3 with the B1 to see if the symptom is based on the memory or the slot.
Hi... I have dell r620 with SAS, SSD and NVMe use PCIe card.This server use mixed memory dual-rank and quad-rank total memory 144.00 GB [IMAGE]   in several days... my server anomali. server often restart. i cek log on idrac, i see error [IMAGE]   Has anyone experienced this?, is there anyone who can help me with this problem?  
Server often restarts itself, log IDRAC "CPU 1 machine check error detected."