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December 22nd, 2025 23:21
UEFI0097 Unable to enable the Advanced ECC memory operating mode
I was just working to decommission some M630 hosts, and move useful memory (All DIMMS are the same size and rank, but a mix of 2400 and 2666) into other M630 hosts that could use it, and the first host we did went fine, no issues. Added the memory sticks and it was happy. The second server, however, has me pulling my hair out. It, like the first one was populated with 16 64GB DIMMs, with four empty and usable slots due to the CPU and heatsink config. We put four more 64GB sticks in and afterwards, I get the error listed below. I couldn't figure out where the breakdown was, especially considering the nature of the previous host with different speeds of the same size and ranking memory installed being happy, so as a last ditch, I pulled all of the 2666 DIMMs and every slot is populated with DIMMs of the same size, rank, speed, manufacturer manufacture year and even same part number, and I'm STILL getting the below/attached error. Any thoughts?
Origin3k
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December 23rd, 2025 00:12
I assume that your old M630 have Memory Operating Mode set to Adv. ECC but now you have changed the memory configuration which doesnt meet the requirements.
So press F2 and to into the BIOS setup and change the Memory Operating Mode to "Optimizer Mode" which also is the default one.
Regards,
Joerg
DELL-Young E
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December 23rd, 2025 05:43
Hello for decommissioning this video may help: https://www.dell.com/support/contents/en-in/videos/videoplayer/how-to-use-the-repurpose-or-retire-system-feature-of-the-poweredge-lifecycle-controller/1712133275901669999
For the error you see, you can refer to this one: https://www.dell.com/support/manuals/en-us/poweredge-r440/eemi_automated_2024/uefiuefi-event-event-messages?guid=guid-591e2277-0b48-4ca7-a236-8e9adad8516e&lang=en-us
You can send us your service tag by DM if you want us to have a look at original configuration https://www.dell.com/community/en/direct-messaging
Respectfully,
Subnet_Mask
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December 23rd, 2025 20:42
So I got it straightened out.
The exact requirements for Advanced ECC aren't real clear in the manual, and when I looked in the BIOS, it 'appeared' to be in optimized mode, not Advanced ECC, and with every DIMM being exactly the same, it didn't make any sense. Maybe with Advanced ECC, all slots in a bank need to be populated, so with two 'green' slots per CPU blocked by the heatsink, maybe it didn't like the first pair of spots populated and not the second?
Anyway, I defaulted the BIOS and then went back and made sure any needed changes were made and it was happy after that. My guess is that his motherboard had been replaced at some point (It's at a different BIOS revision than the others), Advanced ECC was enabled and somehow by chance, it was happy with the memory that was installed until we added some.