Howto properly replace memory R910

Hello,

We have a Poweredge R910 with 128GB ram (32x4GB)

Recently a dimm failed (E3 and E4), this resulted in only 96GB available mem (complete riser is disabled).

We purchased spareparts via Dell and installed the new dimms for E3 and E4.

After the installation, the system only shows 96GB and still gives the warning:

Memory Initialization Warning: Memory size and/or performance may be reduced.
Memory Riser E disabled - DDR training error.

DDR training error: Memory Riser E DIMM 4
Memory Riser E Lockstep Pair DIMM 3 & DIMM 4 disabled,
Please replace the DIMM or remove the lockstep pair.

This is the same warning before the replacement.

After booting into the System menu (F10), i ran a memtest. This failed with a error like: There is still a warning in the eventlog, clear the eventlog.

After clearing the event log, the system menu shows someting like: E3 & E4 replaced. And i'm able to run the memtest.

I rebooted the system, but it still only shows 96GB and gives the same Memory Initialization Warning as described above.

I think the memory is good and the error needs to be cleared/riser needs to be enabled. But how do i do this? Or am i missing something?

 

Thanks in advance!