I think you've done it all, any options to return the Samsung DIMMs?#Iwork4Dell
I have a rack of PowerEdge R810 servers.  Each server has 4x Intel Xeon E7-4870 CPUs. The BIOS version is 2.11.0.  I purchased 128GB of RAM (8GB DIMMs x 16) to add to the 64GB of RAM (4GB DIMMs x 16) already in each server. I put the 16GB DIMMs in A1-A4, B1-B4, C1-C4, and D1-D4, and the 4GB DIMMs in the remaining slots. This configuration is shown in the last row in the table in the manual on page 104.  [IMAGE] All of the Hynix DIMMs that I purchased worked as expected with no errors. I received some Samsung M392B1K70CM0-CH9 DIMMs (8GB 2Rx4 PC3-10600R) that are giving me the following error during boot for each one of the 8GB Samsung DIMMs:  "DIMM unsupported: DIMM xx. Lockstep Pair xx & xx disabled. Please replace the DIMM or remove the lockstep pair.  Despite this error:  If I remove the 16 4GB DIMMs, I get the same error, but the BIOS still recognizes the 128GB of RAM that is says is unsupported.  So, my questions are: Thanks in advance to anyone that can help. David  
R810 unsupported DIMM error on boot, but memory recognized by BIOS and OS