Qentijn, What I would suggest that you do is to power the server down, then pull the power cords out and hold the power button for 20 seconds to drain flea power. Then I would suggest that you swap E3 and E4 to another matching pair of dimms within the server, preferably on another riser. After that then reseat the original riser the dimms were on.  The reason being is that will test the riser, dimm, and slots. If the error follows the dimms to the new slot and riser, then it lets us know the original riser and slots are good. So after all that then power the server up, then access Now with the dimms, can you verify that the part numbers match the dimms they are replacing.  Lastly, would you verify that CSIOR ( Collect System Inventory on Restart ) is  enabled, you can enable/disable CSIOR through the iDRAC Configuration Utility by pressing during boot up.  Also, it could be helpful if you private message me the svc tag, so I know what is installed.  Let me know what you see.
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 4Memory 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!
Howto properly replace memory R910