So, the solution is to install other RAM dimms which are supported officially. It is weird that one processor is fine with the same memory and two not, but this is a reality. Both servers works just fine with RDIMM's 2Rx4. The memory which doesn't work with two 2680 v2 processors works well with older processors, but you don't have guarantuee. So my advise, use officialy supported ones or test and replace with other memory modules if you see same issue.
Hi, I have m1000e chassis with 4 M620 blades. 2 were running for a year, I have added two more now. Those two newly added I equipped with 2x E5 2680 v2 + 4 x udimm 8GB. They are stuck on "Configuring memory..." both, the same. I thought maybe memory issue/incompatibility, I replaced RAM with ones already working in previous 2 servers -> result same Then I removed cpus and I have installed just one CPU and "new" memory, but just one in A1 slot -> server works I was happy. I did full update of firmware, BIOS 2.9.0, Idrac 2.65.65.65 and so on.   I thought my problems are gone. I installed again two CPUs (E5 2680 v2) + memory A1, B1 -> again "Configuring memory..." Then I thought, maybe second CPU issue, I put second CPU in slot 1 -> it works, so both CPUs are ok if working in slot 1, alone, in single cpu configuration. Then I entered again both CPUs and memory A1, B1 -> again "Configuring memory..."   So the conclusion is server works when only one CPU installed, when two installed it doesn't. Both CPUs work well in a single CPU configuration, so it shouldn't be a CPU failure.   I would say mainboard issue or CPU 2 socket, but why two server blades behave exactly same? Any ideas? Two blades with same mainboard/cpu 2 socket failure?   CMC firmware 6.21 - latest Same CPUs 2 x E5 2680v2 I have entered to one of my "old" M620 and they work well, memory same as inserted to new blades installed in other blade also work well, so compatibility is not an issue I hope.
M620 works with one cpu, not with two