SK Hynix 1024 GB (16x64 GB) DDR4 ECC 2933 MHz RAM shows errors on the Supermicro motherboard

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aeugene1977

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Jan 13, 2023
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Hello.
I have a problem: the SK Hynix 1024 GB (16x64 GB) DDR4 ECC 2933 MHz RAM, models HMAA8GR7MJR4N-WM (14 pcs) and HMAA8GR7AJR4N-WM (2 pcs) shows ECC errors on two different Supermicro H11DSi-NT motherboards with two Epyc 7282 processors, as well as on two different Supermicro motherboards H11SSL-i with a 7282 processor when tested by the Memtest86 program (in all tests).
I also tested only 512 GB (8 pieces) and 256 GB (4 pieces) on a motherboard with 7282 processors - the same errors ECC.
However, the same memory works without errors if you install Epyc 7551p processors (on single-processor motherboards, there are no other processors available for dual-processor boards except 7282). The memory was divided into 512 GB halves and tested in 2666 MHz mode (this is the maximum for 7551p).
I ordered two more Epyc 7601 processors to test on dual-processor motherboards in 2666 mode, I am sure that there will be no errors there either. I attached screenshots. Therefore, I have a question - what is the cause of these errors, and is there any way to eliminate them, for example, by setting the BIOS?
 

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RolloZ170

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Apr 24, 2016
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EPYC and SM don't like Hynix. can be a BIOS compatibility issue. add some timing penalty ? don't know if possible in your BIOS.
note you have two different BIOS, one for Naples, one for Rome, two AGESA
 
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aeugene1977

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Jan 13, 2023
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RolloZ170 said:
EPYC and SM don't like Hynix. can be a BIOS compatibility issue. add some timing penalty ? don't know if possible in your BIOS.
note you have two different BIOS, one for Naples, one for Rome, two AGESA
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Yes, it is possible that it is. Now I'm testing 2Tb of RAM on the same boards (16 128 GB Samsung 2933 Mhz) - there are no errors.
 
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Advin

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Jun 10, 2023
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Are you sure the DIMMs aren't overheating? I've seen ECC errors before with overheating DIMMs so it may be worth a shot
 
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aeugene1977

Member
Jan 13, 2023
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Advin said:
Are you sure the DIMMs aren't overheating? I've seen ECC errors before with overheating DIMMs so it may be worth a shot
Click to expand...
No, I think there was no overheating, there were coolers for blowing, besides, errors appeared almost immediately, after 2-4 minutes
 
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