Seeking some education on 9004 es CPUs and motherboard combos.

[charlatanshost]

Hey guys, I just bought a Genoa Epyc
100-000000479-09

BO 2151PGT

119794C.

I got a good deal on it, so I bought it more so impulsively.

I know there's not a lot of information on the 9004/9005 epyc es models, and I've been scouring the Internet to find any and all information I can find.
I wanted to know if there is an confirmed way to check the stepping by the serial? My best educated guess based off of what I can find is the first 2 places on the second line, I'm guessing mine should be B0 stepping.

The second thing is the only motherboard combo I've seen with this specific model number ending in -09 is with a supermicro h13ssl-n or NT, which leads me to think the -09 may not post with other motherboards, I've seen a few users with the last digits ending in -13 have run other motherboards.

But I would like to know more as I've been interested in getting a gigabyte Mz33-ar0 instead of a H13SSL-N.

Thanks in advance, this will be my first AMD build since the AMD x64 dual core CPUs, I've been running Intel builds since then (various Xeon and Intel i3/i5/i7)

 

[RolloZ170]

I wanted to know if there is an confirmed way to check the stepping by the serial?

no but any 100-000000479-09 is same stepping A (bad DDR5-3600)

https://forums.servethehome.com/index.php?threads/genoa-es-cpus-sm-h13ssl-bundles-on-ebay.41781/#post-419843

 

[RolloZ170]

The second thing is the only motherboard combo I've seen with this specific model number ending in -09 is with a supermicro h13ssl-n or NT, which leads me to think the -09 may not post with other motherboards

H13SSL need BIOS 1.0(AGESA GenoaPI-SP5 1.0.0.2) (first full of bugs and vulnerabilities)
next BIOS 1.1a(AGESA GenoaPI-SP5 1.0.0.3) lacks stepping A0 support.

But I would like to know more as I've been interested in getting a gigabyte Mz33-ar0 instead of a H13SSL-N.

MZ33-AR0 earliest BIOS F05 i have lacks A0 stepping microcode, can maybe added but AGESA GenoaPI-SP5 1.0.0.3 may not support A0.

 

[TrashMaster]

I have bought a good number of ES/QS marketed Epyc's across Rome/Genoa. When I went Turin, I paid retail.

The clock speeds are not good, and while this is fine for many lab scenarios it does cause issues with single core workloads. Also, I have a number of these where a given core is not stable and needs to be disabled in the bios or excluded in grub, might have one or more memory channels that is flakey, etc.

I have bought Xeon's marketed as QS and they had retail clocking, all memory channels and pcie lanes, etc. Highly recommend the QS xeon, would not recommend the same of Epyc.

Edit for grub boot example excluding one unstable core on my proxmox epyc:

root@rome:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.14.11-4-pve root=/dev/mapper/pve-root ro quiet isolcpus=27,75 nohz_full=27,75 rcu_nocbs=27,75 irqaffinity=0-26,28-74,76-95

 

[charlatanshost]

I have bought a good number of ES/QS marketed Epyc's across Rome/Genoa. When I went Turin, I paid retail.

The clock speeds are not good, and while this is fine for many lab scenarios it does cause issues with single core workloads. Also, I have a number of these where a given core is not stable and needs to be disabled in the bios or excluded in grub, might have one or more memory channels that is flakey, etc.

I have bought Xeon's marketed as QS and they had retail clocking, all memory channels and pcie lanes, etc. Highly recommend the QS xeon, would not recommend the same of Epyc.

Edit for grub boot example excluding one unstable core on my proxmox epyc:

root@rome:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-6.14.11-4-pve root=/dev/mapper/pve-root ro quiet isolcpus=27,75 nohz_full=27,75 rcu_nocbs=27,75 irqaffinity=0-26,28-74,76-95

Ah okay, I may save this CPU for something else later on then, trying to build a workstation for video editing, CAD, 3d rendering, and some simulations.

no but any 100-000000479-09 is same stepping A (bad DDR5-3600)

https://forums.servethehome.com/index.php?threads/genoa-es-cpus-sm-h13ssl-bundles-on-ebay.41781/#post-419843

H13SSL need BIOS 1.0(AGESA GenoaPI-SP5 1.0.0.2) (first full of bugs and vulnerabilities)
next BIOS 1.1a(AGESA GenoaPI-SP5 1.0.0.3) lacks stepping A0 support.

MZ33-AR0 earliest BIOS F05 i have lacks A0 stepping microcode, can maybe added but AGESA GenoaPI-SP5 1.0.0.3 may not support A0.

That's unfortunately what I was afraid of, I saw your posts in that thread, which lead me down further researching. But your information is greatly appreciated. For the price of a H13SSL-N at the moment I can buy a known fairly stable Xeon sapphire rapids es or qs, and motherboard, so I might just take that route for now.