Lenovo M90S RAM speed issues.
reddit / selfhosted

----------------------------------------------------------------------
Aware-Data8635 · 2023-11-25 03:12

I have recently upgraded my homeserver to Lenovo M90S Gen4 SFF with
i5-13600.It has a Q670 chipset. I ordered it with 16 GB of RAM and it
came with a Samsung DDR5 UDIMM module with an advertised speed if
5600MT.In the bios hardware summary I could see this module working at
4400MT(assuming its chipset limit) Then I got a 64GB DDR5 kit of
Patriot viper of advertised speed of 5600 MT. After installing them, I
am only getting 2000MT speed in the BIOS. Unfortunately, there are no
option to control the RAM configuration in the BIOS of Lenovo M90S. Is
there a way by which I get at least 4400MTs from all 80GB RAM? If not
what is the better tradeoff? 64GB at 4400MT or 80GB at 2000MT?
I will be using this machine as Proxmox node.

----------------------------------------------------------------------
Acrobatic_Assist_662 · 2023-11-25 04:45

I don’t think this is the right sub. You might get better luck at
r/techsupport or r/buildapc

That being said, if you’re using 4DPC (dimm per channel) it runs in
gear 2 which SHOULD kick you down to 4000 and maybe lower depending on
your bios settings

If you use 2DPC you should have a much easier time getting the 5600.
Pretty sure the memory limits are closer to cpu limits than chipset
since the controller is on the cpu and not the board. Update your bios
if it’s not already up to date and look for an advanced option for
more info. I picked up a M90s Gen 3 with a 12500 and I preferred the
text bios to the graphical, you may have better luck there finding
what you need

----------------------------------------------------------------------
Aware-Data8635 · 2023-11-26 05:38

Thanks.I just posted in techsupport