Supermicro X11SSL Boot to Bios and finicky RAM

[techtoys]

I could not boot into the BIOS on this board. It would switch off after PEI Intel reference code execution followed by 0x18=mrcColdBootRequired

The board requires ECC DDR4 UDIMM 2400 (max).
I was plugging in 1 or 2 sticks of 16GB ECC DDR4 UDIMM 2666.

I then tried 1 stick of 16GB DDR4 3200 non-ECC. This allowed me to boot into BIOS.
After that I added both sticks of ECC DRAM from above and the BIOS shows all 3 sticks for a total of 48GB.

I can boot into the BIOS but only if I include the 1 stick of non-ECC 3200.
Any ideas?

My first hypothesis was incompatible DDR4 ECC but 2666 should work at 2133 or 2400.
... and the board boots with these sticks but only if I include another stick.

 

[colxfy]

I have exactly the same problem today with my X11SSM-F which is a sister board of yours.

 

[B1scu1T]

Have you checked which slots you have used?

What is a bit strange with the X11SSH-F, which is a similar board, is that it asks you to put the first stick in slot B2, followed by A2, then B1 and A1.

B2 is closest to the edge of the board, and A1 the CPU. Worth checking if this is the issue.

 

[RolloZ170]

CPU with no ECC support ?

 

[ericloewe]

What is a bit strange with the X11SSH-F, which is a similar board, is that it asks you to put the first stick in slot B2, followed by A2, then B1 and A1.

Not strange at all. It's typically much better to be at the end of the transmission line, rather than have a stub dangling past the memory.

 

[B1scu1T]

Not strange at all. It's typically much better to be at the end of the transmission line, rather than have a stub dangling past the memory.

It was more the fact they labelled that slot B2 that I find strange. Why not label that one A1?

 

[colxfy]

Have you checked which slots you have used?

What is a bit strange with the X11SSH-F, which is a similar board, is that it asks you to put the first stick in slot B2, followed by A2, then B1 and A1.

B2 is closest to the edge of the board, and A1 the CPU. Worth checking if this is the issue.

That was interesting information and sounds promising. Confirmed on the X11SSM(-F)/X11SSL(-F) User Manual, page 34.

I myself started with slot A1. I will test it tomorrow. Thank you for pointing this out!