H12SSL and Epyc can't handle the ram

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thatch45

New Member
May 12, 2022
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Actually, I did get hynix ram, and it has been just fine. It was certified by supermicro, I think the ram I had before was just too slow
 
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gb00s

Well-Known Member
Jul 25, 2018
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While having the same issue with Micron/SK Hynix & Samsung I figured it's not about 2133, 2400 and/or 2666Mhz or the vendor. My SM boards just do not like 4DRx4 ram. Every 2Rx4 ram, no matter of the vendor and/or frequency just works fine. So don't let someone mislead you that EPYC's do not work with 2133Mhz. They work perfectly fine. My H11SSL-i and H12SSL-i just don't like 4DRx4 while my Gigabyte MZ32-AR0 just doesn't care as long as I use max 8 sticks only. So it has something to do with the 4DRx4 typology.
 
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Bjorn Smith

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Sep 3, 2019
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I am also guessing its a LRDIMM issue - none the two SM boards support LRDIMM - and that memory stick is most likely LRDIMM - and the Gigabyte board support LRDIMM.

And its not unusual for boards to not behave when mixing RDIMM with LRDIMM - none of my supermicro boards could run with a mix - and my dell servers the same.
 

zer0sum

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Mar 8, 2013
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I am also guessing its a LRDIMM issue - none the two SM boards support LRDIMM - and that memory stick is most likely LRDIMM - and the Gigabyte board support LRDIMM.

And its not unusual for boards to not behave when mixing RDIMM with LRDIMM - none of my supermicro boards could run with a mix - and my dell servers the same.
According to the H12SSL manual it does support LRDIMM
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vvkvvk

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Feb 1, 2023
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I didn't have luck with Samsung LRDIMMs but regular slow Hynix RDIMMs work just fine. So I'd wager it's not Hynix, but LRDIMMs / 4 rank modules in general

What didn't work:
M386A4K40BB0 2400 32 GB LRDIMM

What works (currently in use, mixed 6 Hynix 2 Micron setup)
HMA42GR7MFR4N 2133 16 GB RDIMM
36ASF2G72PZ 2133 16 GB RDIMM