H12SSL and Epyc can't handle the ram
- Thread starter thatch45
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interesting, i know 2133 not work and hynix has issues sometimes.
ok have fun now.
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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is this RAM LRDIMM ? mayb eits not 4 ranks, its LRDIMM issue ?
your working 2Rx4 is not LRDIMM right ?
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.
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.
note what AMD writes:
2 DIMMs Per Channel 2666 LRDIMM operating at 2133 MHz
the difference between RDIMM and LRDIMM is the LRDIMM contains additional buffers for all data lines.
this requires additional clocks to control. a 4Rx4 LRDIMM is 4 1Rx4 DIMMs in once with the memory-controller signal load of only one DIMM.
2 DIMMs Per Channel 2666 LRDIMM operating at 2133 MHz
the difference between RDIMM and LRDIMM is the LRDIMM contains additional buffers for all data lines.
this requires additional clocks to control. a 4Rx4 LRDIMM is 4 1Rx4 DIMMs in once with the memory-controller signal load of only one DIMM.
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
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
Does this still stand true today, I ask as I have purchased 2nd hand Super micro Modules and so far barring one faulty - all good, I also however have purchased ATECH 64GB modules which are SK Hynix, if it is the case that they wont like my 7C13 and 7313P I still have time to send them back for a refund if I act soon. On the packs they are listed as DDR4-3200 2Rx4 1.2v ECC RDIMM
unknown but many LRDIMM involved in RAM problems, depends on the motherboards vendor too.
DDR4-3200 2Rx4 is not LRDIMM.
LRDIMM have extra data buffer chips(need extra penalty clocks)
we have reports supermicro + LRDIMM not working but same parts work fine on gigabyte, so all my best wished and good luck !