U2 to m2 nvMe cable? Super Micro motherboard

[tturgut]

I have a dual AMD EPYC supermicro motherboard. It has one nvme slot on the main motherboard.
But it has 2 other potential slots:
CN1/CN2 are marked as " NVMe0-1/NVMe2-3 Connectors (both from CPU2) "

1) How can i make this work? I guess i need a U2 cable to connect the M2 nVme?

I found some cables on amazon, but I am not sure if thats what I need;

https://www.amazon.com/Bewinner-Connecting-Drives-SF-8639-Interface/dp/B082WFJWQ6/ref=sr_1_13?keywords=u.2+to+m.2+adapter+cable&qid=1669050869&sr=8-13

https://www.amazon.com/dp/B07VB6L8SJ/?coliid=I15IGXKG8KYL3T&colid=1YUQ5J3D6MSR6&psc=1&ref_=lv_ov_lig_dp_it

2) if I can make this work, will the speed be same as putting a PCI4 Express to nvMe adapter?

thanks!

 

[Sean Ho]

those ports are oculink SFF-8611, no?
(slimsas, see Rollo's comment below)

 

[broadband]

Yes, you can use Oculick to U.2 or Oculink to Mini SAS HD

 

[tturgut]

maybe , thanks...
I have another question: one processor is running all threads at 100%, the second one is running at 50%.. why?

Threadripper S20 Torque screw, HT1 thermal paste etc used. T
Temps are good at CPu and ram.
IPMI shows good ram (16x16GB Dell server RAM) and 2 CPU's

why are both not running at 100%?

 

[Sean Ho]

What OS, what workload, and how are you checking CPU usage? Scheduling of threads to physical processors happens at a granularity of microseconds or less without user intervention -- unless you pinned the workload to a particular cpu or set of cores.

 

[tturgut]

Windows 11, Core temp, Chess program Stockfish 15
one is showing 100% on all cores, the other one is around 50% (not exact, moves)

 

[nabsltd]

Chess program Stockfish 15

IIRC, there's a command line option for this program that sets the number of threads. Perhaps you need to increase that to match your hardware?

 

[RolloZ170]

CN1/CN2 is slimsas SFF-8654 8i (physical connector type, not SAS)
this should work

https://www.amazon.com/SlimSAS-SFF-8654-Cable-Two-Connectors/dp/B09BDHZZ9C

 

[Sean Ho]

thx for the confirmation; apologies for the confusion! Similar connectors, identical pinout, but not the same!

 

[geonap]

is SlimSAS to a N4 backplane possible ?

perhaps https://www.amazon.com/Diliving-SFF-8654-SFF-8643-Broadcom-05-60003-00/dp/B09S37RN91 ?

 

[itronin]

is SlimSAS to a N4 backplane possible ?

perhaps https://www.amazon.com/Diliving-SFF-8654-SFF-8643-Broadcom-05-60003-00/dp/B09S37RN91 ?

edit: I only have experience with the gen 3 n4 backplanes.

maybe? I've heard they exist and indeed you can find slimsas SFF-8654 to dual SFF-8643 - whether the wires line up correctly I cannot say.

btw, the cable that @RolloZ170 linked is showing currently unavailable for me here in the states. Here's another one that is in stock in the states and consumes a single power molex instead of two sata power

https://www.amazon.com/Diliving-SFF-8654-SFF-8639-SlimSAS-Adapter/dp/B098JBS7QD

 

[geonap]

interesting, maybe that's a good buy.

this one specifically mentions supermicro backplanes.

https://www.amazon.com/Diliving-SFF-8654-SFF-8643-Broadcom-05-60002-00/dp/B0B5CWK6V1

 

[geonap]

i bought a bunch of these

Amazon.com: Diliving SlimSAS 8X to 2*MiniSAS HD 4X,SFF-8654 74Pin to 2*SFF-8643 36Pin Cable 80cm(Broadcom MPN 05-60002-00) : Electronics

Buy Diliving SlimSAS 8X to 2*MiniSAS HD 4X,SFF-8654 74Pin to 2*SFF-8643 36Pin Cable 80cm(Broadcom MPN 05-60002-00): Mini-SAS Cables - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

and put them into H12DSI with sas 3 backplane's + N4 and nothing's being detected, on multiple servers.

i'm either not doing something right or the cables aren't the right cables.

edit, one is now working, trying rest

 

[deza]

Hi there, I was wondering if anyone figured it out how to make this work?
I also have H12DSI Supermicro with 2 CN ports and according to the docs I should be able to connect 2 NVME M.2 each. I found something like this GD9801G (3.5" SLIMSAS 8I (SFF-8654) TO M.2 NVME SSD X2 ADAPTER) but the guy is not sure if that is compatible with the CN motherboard connector. Also which cable to use with it, gdc74-5502 cable?

 

[geonap]

i have never tried that, i wouldn't know. i have maybe one cable like that but it's a dell part.