RDIMM DDR4 32GB: Samsung M393A4K40DB3-CWE

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sovking

Member
Jun 2, 2011
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Hi guys,
I am not able to find the full datasheet of this Samsung memory: Samsung M393A4K40DB3-CWE.
Because I need to swap this memory between some server for testing purposes, I would like to check that this binned part is able to work well also at lower speeds: at least 2933, 2666, 2400.
Maybe someone of you found it ? or can give me any advice about using it at lower speed ?
 

hmw

Active Member
Apr 29, 2019
570
226
43
I’ve used M393A4K43DB3-CWE - which is 16GB - at 3200, 2933 and 2666 speeds, without problems. Didn’t try 2400

Ran ESXi and some VMs for a week at 2933.

I guess it depends on whether the BIOS can either apply sane values for the lower speeds OR let you choose.

For my EPYC motherboards, I don’t see a way to apply specific CAS, tRCD, tRAS and tRP values. On the other hand timings are less tight the faster the memory is, hence even if there’s no SPD support for the slower memory speeds - perhaps the defaults for the higher memory speed when applied to slower MHz will work fine