Supermicro H12SSL-i, H12SSL-C, H12SSL-NT, H12SSL-CT boards - notes, experiences

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RolloZ170

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Apr 24, 2016
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boot takes forever with them in, 1-2min to start
takes generaly longer on cold boots, Dell does not run long memtest, but SM does. EPYC does not like LRDIMM(some hate me for this)
EPYC does not like Hynix. and EPYC does not like 3DS (they are supported, but picky)
EPYC don't support 4R RDIMMs
 
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scline

Member
Apr 7, 2016
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Ah thank you, will stay away from LRDIMM's for now then. Its a lab box so really doubt I will need the capacity - they were just a good price ($80/each) :p
 

ano

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Nov 7, 2022
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I've used H12SSL with 64GB LRdimm (HPE oem 3200) I can get part nr
 

RolloZ170

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Apr 24, 2016
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I've used H12SSL with 64GB LRdimm (HPE oem 3200) I can get part nr
3200 have timing reserves. sometimes the clock-buffer(especialy the Montage) makes issues.
i my experience LRDIMM weares out. your can run 2400 at 2133 mostly with no issue, but not at spec.2400.
 

ano

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Nov 7, 2022
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I'll grab the part numbers, its a 7763+ 8x 64GB on H12SSL-i in one system, and dual 7763 on h12dsi-nt in another test, I've also tested with 75F3 cpu, I can run tests with 7402 and 7443 if anyone wants.


7763 + the 3200 512GB = beast, with both the 7763's and 75F3 the 3200 memory finally makes sense
 

RolloZ170

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can run tests with 7402 and 7443 if anyone wants
7003 is improved/different memory controller. and your memory is newer gen.
the issues are with used old gen LRDIMM 2133/2400 and mostly Hynix.
 

scline

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Apr 7, 2016
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7003 is improved/different memory controller. and your memory is newer gen.
the issues are with used old gen LRDIMM 2133/2400 and mostly Hynix.
And that is exactly the type of Memory I used ;) 2400 Hynix. The 3200 stuff was almost double the price, but in the future will target that on this picky CPU/Mobo if I need to go past 256GB

On a side note, the 2400/2133 32GB sticks I had lying around overclock on this platform to 2933 w/o a hitch (memtesting over the past 24 hours w/o any errors). Doubt I need, or should go to 3200 with the fabric clock on7002's syncing with 2933 speeds.
 

james23

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Nov 18, 2014
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I have a h12ssl-i in coming (to replace my h11), can some one confirm if either of these cables will work to connect from the h12's on-board SlimSAS x8 port to a single Optane U.2 nvme drive (this is the only disk-drive, of any kind, i will run on the system, as its my win11 boot drive)

>Supermicro 55cm Slimline x8 to 2x U.2 PCIE with Power Cable (CBL-SAST-0953)
supermicro eStore link:

or

> Diliving SFF-8654 to SFF-8639 Cable, SlimSAS 8i (SFF-8654 74P) to 2 Port U.2 NVMe Adapter (SFF-8639 68P) Cable with Power, 75CM
amazon link:

( the exact drive is a single a Optane p4801 375gb U.2 , is dell branded thus the 375gb unusual size - its been running on h11ssl-NC board for over a year now as its my win11 boot drive).

thanks
 

ano

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Nov 7, 2022
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I run that exact drive, on that exact motherboard, with thoose specific cables. it works.

I actually have 10 of them, remaining 8 connected via pci-e 4th gen and bifurcation
 
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james23

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Nov 18, 2014
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I run that exact drive, on that exact motherboard, with those specific cables. it works.
Thank you for the reply, i assume your referring to the supermicro official cable? or are you referring to the amazon one? (i ask as , in my case, its a price difference of $68 shipped, vs $26 shipped)
 

ano

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Thank you for the reply, i assume your referring to the supermicro official cable? or are you referring to the amazon one? (i ask as , in my case, its a price difference of $68 shipped, vs $26 shipped)
I have the specific supermicro cable, but I have also tested 3rd parties, all work so far
 

serverhomeathome

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Jan 20, 2023
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For completeness sake, here's what I have working with ZFS RAID 1 on the root volume for my lab:

Motherboard: H12SSL-NT
CPU: EPYC 7502P
m.2 NVME: 2x Samsung PM983
OS: Proxmox 7.3 (currently on kernel 5.15.83-1-pve)

I've also used the -CT and -i variants of the same board, and used the same RAID 1 setup on those without issue.



I bounced a host to check this: no, I didn't change the firmware source in my installation.

@serverhomeathome Since you haven't actually been able to install an OS yet, could you download the Proxmox 7.3 installer and see if it sees both drives?
Thank you for offering to install Proxmox. I just repeated the same steps when booted from Proxmox iso and it got me to see two the same SSDs in M.2. I repeated the same thing with Debian iso and it shows two SSDs now too. What issue was that M.2 ports are designed terrible on this motherboard, I mean they are too close to each other and my two Thermalright radiators on SSD couldn't placed properly. Now I use only one Thermalright radiator on SSD and another SSD has standard one from Netac.
 
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serverhomeathome

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Jan 20, 2023
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I have board for 2 disks which fits PCIe x8 slot and it works without issues, and would like to have one x16 for 4 disks.

Would someone advise for H12SSL-i 100% working 4-disk M.2 NVME to PCIe 4.0 adapter card from Aliexpress? I recently bought adapter card for 4 disks and it doesn't show disks no matter how many inserted in it or PCIe slot or bifurcation variation.
 

ano

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Nov 7, 2022
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very hit miss, mostly miss, pci gen4 (verified linkspeeds) are often slower than aoc-slg3-2m2
 

RolloZ170

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Apr 24, 2016
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Would someone advise for H12SSL-i 100% working 4-disk M.2 NVME to PCIe 4.0 adapter card from Aliexpress?
i bought similar 4x M.2 low profile: they use same buffer chip than supermicros Gen3 cards.
does not say it will not work, but i would expect a Gen4 buffer on it.
 

serverhomeathome

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Jan 20, 2023
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i bought similar 4x M.2 low profile: they use same buffer chip than supermicros Gen3 cards.
does not say it will not work, but i would expect a Gen4 buffer on it.
what the model is? If zero cards with PCIe4.0 support for our motherboards on current market, I will buy this one to see my drives at least.
 

serverhomeathome

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Jan 20, 2023
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i bought similar 4x M.2 low profile: they use same buffer chip than supermicros Gen3 cards.
does not say it will not work, but i would expect a Gen4 buffer on it.
Manufacturer of this card LRNV95NF answered me that their card works with H12SSL from a client's feedback. They provided me Test Report about speeds, I don't know if it uses PCIe4.0 from there, you can look at here Upload files for free - LRNV95NF_Test_Report.pdf - ufile.io
 

ano

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Nov 7, 2022
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linkreal? I have a linkreal m2 x2 low profile, speeds are horrible, it sais its gen4 speeds, but IO i lower than gen3 supermicro (with PM9a3 3.84 gen4 m.2)