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3657
November 14th, 2019 14:00
R810 unsupported DIMM error on boot, but memory recognized by BIOS and OS
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.
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:
- The correct quantity of RAM (192GB) is recognized by the BIOS and the OS
- The DIMMs are recognized by the UFEI hardware utility
- The DIMMs pass the MpMemory utility check built into the server.
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:
- Why is this DIMM unsupported? The specifications I've looked at match, but I could be missing something. The only thing that is strange about these DIMMs is that they are not as tall as the other 4GB and 8GB DIMMs.
- If the RAM is recognized by the BIOS and the OS, and passes the memory test, are the error messages actually false messages?
Thanks in advance to anyone that can help.
David
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DELL-Rey G
3 Apprentice
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1.1K Posts
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November 19th, 2019 11:00
I think you've done it all, any options to return the Samsung DIMMs?
#Iwork4Dell
DELL-Rey G
3 Apprentice
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1.1K Posts
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November 14th, 2019 16:00
We should first try to determine which version of the R810 you have. Since you have the E7-4870, I would think you have the R810II (roman numeral 2), but we should be sure. See page 3 to determine which version your R810 is: https://downloads.dell.com/manuals/all-products/esuprt_ser_stor_net/esuprt_poweredge/poweredge-r810_user%27s%20guide4_en-us.pdf
The top of page 6 says if your system is not an R810II, you should update the CPLD, Bios (you did already) and idrac. I would recommend updating them if they arent already updated.
CPLD: https://www.dell.com/support/home/us/en/19/drivers/driversdetails?driverid=3gvk7&oscode=ws8r2&productcode=poweredge-r810
IDrac:https://www.dell.com/support/home/us/en/19/drivers/driversdetails?driverid=9gjyw&oscode=ws8r2&productcode=poweredge-r810
the idrac update can be uncooperative at times depending on the currently installed version. If the windows 32bit .exe file on the site gives you problems, download the FW_IMG.exe version, extract the files and use the firmimg.d6 file via the idrac gui update method.
Lastly, I googled the model of the Samsung dimm, and it shows that the dimm is low voltage capable. This made me wonder about page 7 of the doc in the first link. The Memory Operating Voltage setting might help, and I would try one of the other settings if its already set to Auto. On page 8, the processor settings section, try disabling the C States in the bios as well.
I'm not sure if you tried just the Samsung dimms to see how they behave by themselves, just a thought. Let us know how it goes.
#Iwork4Dell
DavidHawn
3 Posts
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November 15th, 2019 11:00
Thank you for this guidance.
You are correct, I have the R810II machines.
I updated the CPLD to 1.5.0. I updated the iDRAC to 2.90. The BIOS was already on version 2.11.0. I tried removing the original sixteen 4GB DIMMs so that the only DIMMs installed were the sixteen 8GB Samsung DIMMs. I tried disabling the C-states in the BIOS. I am still getting the same unsupported DIMM errors. The BIOS doesn't give me the option to change the voltage when the 4GB and 8GB DIMMs are both installed, the only option is Auto. With only the 8GB Samsung DIMMs installed, I still don't have an option to change the memory voltage.
Is there anything else I can try?
Thanks again!
DavidHawn
3 Posts
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November 20th, 2019 07:00
That is what I ended up doing. In hindsight, I should have tested the Samsung DIMMs for a few days with prime95 to see if there were any errors before sending the DIMMs back.
Thanks again,
David