[SOLVED] Supermicro X11DPi-NT 2nd CPU is not recognized and only one 32GB RAM stick is working

[koval]

Hi,
I recently bought:

• Supermicro X11DPi-NT motherboard
• 2x Intel Xeon Gold 6148 2.40GHz 20-Core CPU SR3B6
• 12x Hynix 32GB PC4-2933Y-R 2Rx4 Registered RAM DDR4 PC4-23400 HMA84GR7JJR4N-WM

The PSU is Seasonic Focus GX650. It’s connected to mobo with two 8-Pin connectors and the 24-Pin connector.

The motherboard is running the latest available BIOS version and IPMI:
Firmware Revision: 01.74.14
Firmware Build Time: 11/30/2023
BIOS Version: 4.4
BIOS Build Time: 08/16/2024
Redfish Version: 1.8.0
CPLD Version: 02.B1.0F

Unfortunately I’ve got 2 major and 1 minor issue with this setup:

#1 - the 2nd CPU is not recognized.
#2 - All but one memory sticks for CPU #1 are marked as OK. None of the sticks for CPU #2 show up in BIOS (probably because of the CPU issue).
#3 - IPMI doesn’t show any sensor readings.

re. #1
The 2nd CPU doesn’t show up in BIOS, neither in IPMI. I swapped the CPUs around and only the CPU in slot 1 works. So, it means that both CPUs are fine, and it suggests that something is going on with the motherboard.

re. #2
RAM is populated according to the manual for 2 CPUs and 12 DIMMS:
CPU1: P1-DIMMC1/P1-DIMMB1/P1-DIMMA1/P1-DIMMD1/P1-DIMME1/P1-DIMMF1
CPU2: P2-DIMMC1/P2-DIMMB1/P2-DIMMA1/P2-DIMMD1/P2-DIMME1/P2-DIMMF1
I’ve also set the RAM speed in BIOS to 2666Mhz (it Auto mode, it was also set to 2666).

The Memory Topology page in BIOS shows only P1-DIMMC1 as OK.
When I populated only that bank P1-DIMMC1, the mobo failed to start with “All channel are disabled due to memory test failures”! Yikes!

The Health Event Log in IPMI is full of following entries:

• DIMM mapped out … - Asserion
• Failing DIMM: DIMM location (Uncorrectable memory component found). (P1-DIMMF1) - Assertion entries

I’m bit lost here now.
Any ideas what’s going on here?

Thank you

[TryTwiceMedia]

Reseat the second CPU.

Also, I’d pull all but 1 DIMM per CPU til you can get it to post.

Then load it back up.

I’ve got this same build in my office right now, LGA 3647 can be a pain to seat perfectly.

Also, reset the UEFI and ILOM configurations to default.

[koval]

Thanks!
I’ll give it a go and report back.

[koval]

Thank you so much @TryTwiceMedia
After inspecting the pins in the socket (I haven’t noticed any issues) I reseated the CPU and tightened up the mounting screws a bit more and it worked like a charm.
Both CPUs are now working find and all memory sticks were recognized straight away!

Happy days!