Ah, interesting. Mine might as well for all I know; I just ran it without them and it worked. Good to know, though without saves those five keystrokes…
I used copy & paste from the IPMI web interface - that’s how I noticed.
I’m sure the problem is that I bought the wrong part, but I’m not seeing how. As I read Supermicro’s product page for this board, it supports DDR4 RDIMMs and UDIMMs, up to 32 GB capacity, at clocks up to 2133 MHz. Great. So I bought this DIMM, installed it yesterday, and tried to boot the system.
No dice; I get this error:
An 8 GB DIMM I have on hand works fine, in the same DIMM socket (the one furthest from the CPU), though it’s a ECC UDIMM rather than a RDIMM.
It could of course be that I have a faulty DIMM, but the error sounds more like a configuration problem. Did I miss an incompatibility here?
Curious is that the error refers to DIMMA4; there is no such DIMM (or socket) on this motherboard. The four DIMM sockets are marked DIMMA1, DIMMA2, DIMMB1, and DIMMB2.
I did not try if my board shows similar issues with the 4x32 GB 
4x 32GB 128GB RDIMM ECC REG 2133Mhz DDR4 Speicher f Supermicro X10SRL-F | eBay (albeit not for that insane price).
Have to canabalise another system to get it running. will post here…..
You may recall my troubles with my version of the same board (different CPU) and memory. Only once I put in memory off the list where every SKU digit matched did it recognize all four sticks.
In my case, I had been sent more recently-made memory with just a revision to the RAM chips used. That made my system recognize only two out of all four sticks. Could be any combination thereof, by slot, etc. They passed all memory tests too.
Had to send those sticks back for an EXACT SKU match off the QVL or whatever it is called and then the system recognized the memory just fine.
I haven’t ordinarily been one to chase QVL part numbers, as long as specs match. But this Reddit post suggests that the issue is using LRDIMMs, which aren’t supported. The eBay listing didn’t indicate this was a LRDIMM; let’s see if I can dig up a datasheet of some sort from the manufacturer to see.
This FAQ entry from Supermicro seems to concur, though it isn’t with exactly the same motherboard.
Not an official source, but this vendor indicates it’s a LRDIMM.
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Was going to suggest this. Notably the D’s do not support LR-DIMM
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Ah, lovely. 25.10 installs just fine, but doesn’t boot:
Surely it can boot from the onboard m.2. Maybe not?
I think @Stux is running a similar board. Maybe he can help ?
Having the same issue now trying to boot from the nvme.
Looks like you need a custom BIOS to boot from NVMe? WTF, Supermicro?
What’s the point of having this slot if it can’t be used for a boot device?
On the RAM front, this Crucial part worked:
According to
the patriot p300 seems to work. Just ordered the exact same one.
AFAIK that slot supports M.2 SATA SSDs, too. If it’s just for booting …
Using it with a sata m.2 disables another sata port tho….
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CORE definitively boots from the M.2 slot on these boards, no special BIOS involved…
Maybe it’s GRUB and/or some UEFI/Legacy issue.
Maybe the docs were unclear–I thought anything in that m.2 slot disabled SATA1?
A SATA M.2 takes the SATA lane, disabling a port.
A NVMe M.2 uses 4 PCIe lanes, distinct from this shared SATA lane, leaving all 6 SATA ports for use in, say, a Fractal Design Node 304. 
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What exact NVME model are you using ?
Intel p600 and then my go-to 16 GB Optane M10 boot drives. The issue is NOT with the drive.
Make sure you have the “latest” BIOS installed.
Very early BIOSes didn’t support m.2 booting or bifurcation, and that sortof issue. Of course, these teething issues were sorted out back when the boards were first released, but maybe these ones don’t have the fixes yet?