ASUS KRPA-U16 not working with EPYC 7D13 (100-000000322)

[bbchichiYY]

That's right, BMC is indeed not available. If PCIe channels can be freely allocated, then 29 channels are also sufficient.

 

[RolloZ170]

Do you know if the lack of PCIe lanes is a limitation of the CPU or just mobo incompatibility

CPU

PCIe lanes are a major selling point for Epyc so seems weird they'd cut them out.

7D13 ( 100-000000322 36 core) is custom SKU for EPYC northdome. ( AMD created a custom device to meet Meta's needs. )
produced and sold cheap in masses, they know this SKUs come to 2nd hand marked after use. lack PCIe lanes is a good way to disable this.

 

[RolloZ170]

That's right, BMC is indeed not available. If PCIe channels can be freely allocated, then 29 channels are also sufficient.

fixed layout.

 

[upalachango]

That's super interesting. Kinda sad they specifically targeted the second hand market though. It's mostly homelabs and very small businesses interested in these chips and we're really not the market for buying $2000 chips for personal use. But if we get to play with cheap second hand chips at home, guess what we're gonna suggest our companies buy? Well, guess I'm sticking with Rome for my homelab.

 

[Anton2510]

Did you happen to run any CPU benchmarks on this 7D12 CPU? Many other system components added up the power usage, what was the actual idle and loaded power consumption?

The actual idle consumption is 50-53 watts from the wall, max load - 225 watts.
My sistem - KRPA-U16 + EPYC 7D12 + DDR4 2666 4x16 Gb (2R) + SSD NVME Gigabyte 256 + FSP 700

 

[twinyuki]

I found a 7D13 on sale that is different from this possible OPN. It is 100-000001005. Looks like 32 cores.

 

[RickeyRen]

I am currently trying to purchase a 7D13 to replace the 7282 in my NAS to get more cores. So, is it true that the 7D13’s PCIe lanes are limited to only 29? While the 7282 and 7D12 have 128 lanes? My motherboard is the MZ32 Rev 3.0, and my memory is Micron 64GB 4DRx4 PC4-2933Y DDR4 LRDIMM. Has anyone successfully booted up the 7D13 with this combination?

 

[Anton2510]

I am currently trying to purchase a 7D13 to replace the 7282 in my NAS to get more cores. So, is it true that the 7D13’s PCIe lanes are limited to only 29? While the 7282 and 7D12 have 128 lanes? My motherboard is the MZ32 Rev 3.0, and my memory is Micron 64GB 4DRx4 PC4-2933Y DDR4 LRDIMM. Has anyone successfully booted up the 7D13 with this combination?

The seller's response in the AliExpress.

 

[RickeyRen]

The seller's response in the AliExpress.

I’ve decided to buy a 7D13 to replace the 7282 and see what issues might arise. Why do these Chinese CPU sellers seem to be more friendly to foreigners but don’t respond much to questions from Chinese buyers? LOL

 

[gb00s]

Save your time and get a 7D12.

 

[RageBone]

Here are the POST codes on the ASUS KRPA-U16. They go in a continuous cycle:
A1 34 02 50 dE Ad A1 34 02 50 dE Ad ...

Now some time later, i have had similar postcodes on ryzen.
What now stands out to me is the lettering
dEAd
Literally spelling out whats up.
Something is seriously enough wrong for the system to proclaim itself as dead.
A1340250 should be additional error info.
Nothing i have found over the ages points at anything meaningfull to us from this.

 

[RolloZ170]

What now stands out to me is the lettering
dEAd

would be realy funny. but indeed the sequence is very inconsistent.

"DE AD" capsules the main msg(form AGESA)

 

[RageBone]

would be realy funny. but indeed the sequence is very inconsistent.
50 = mem.init error
DE = ??
AD = Ready To Boot event

There really is a "rotating" postcode like that.
It looks totally different to normal postcodes.
So i insist that you can't look at it with the usual "lists" of postcode meanings.

Those dead codes are sent out on ports 0x80 to 0x84 and they rotate through all of them.
No other normal postcode is like that.

Fun fact; Postcodes on AMD are 8 digit and your are missing crucial info if you only look at the port 0x80 ones.

 

[RolloZ170]

Fun fact; Postcodes on AMD are 8 digit and your are missing crucial info if you only look at the port 0x80 ones.

AFAIK they are only appear in Debug mode, and then Port80 16/32 bit.
it is the same if they run AMI BIOS, i doubt the BMC can access other than port80.
but AMD platforms have add.special AGESA codes you normaly not see.

 

[RageBone]

AFAIK they are only appear in Debug mode, and then Port80 16/32 bit.
it is the same if they run AMI BIOS, i doubt the BMC can access other than port80.
but AMD platforms have add.special AGESA codes you normaly not see.

I have never had to turn on any debug mode to receive 8 digit codes on ryzen, nor Epyc nor with retail or ES cpus or boards so far.

Bog standard out of the box H11 and H12 boards, 8 digit postcodes.

And as far as i looked into them, it is 8bits sent on port 80, 81, 82 and 83 to then combine to a 32bit postcode.

Practically, if the bmc can receive port80 codes, it could get the others as well.
Asrack for instance shows you four digits on the romed8.

Part of my problem with Postcodes is that you do see those "super not special" AGESA postcodes on those two digit displays.
Without anything to distinguish those from all the others.

 

[Sonnet]

Has anybody managed to get this cpu working, and if so with which motherboard?
Are the cpu cores Milan generation?
Is it confirmed the cpu handle only 4 memory channels?

 

[Anton2510]

Has anybody managed to get this cpu working, and if so with which motherboard?
Are the cpu cores Milan generation?
Is it confirmed the cpu handle only 4 memory channels?

I see such combinations for sale:

 

[RolloZ170]

Are the cpu cores Milan generation?

yes.

Is it confirmed the cpu handle only 4 memory channels?

no. the Meta target machine takes 6 RDIMMs.

100-000000322 29 PCIe lanes
100-000001005 27 PCIe lanes
on most motherboard the avail. PCIe lanes are not connected (only 2 or 1 usable)
reported to work on Huananzhi H12D-8D (no proof so far)

 

[Sonnet]

yes.

no. the Meta target machine takes 6 RDIMMs.

100-000000322 29 PCIe lanes
100-000001005 27 PCIe lanes
on most motherboard the avail. PCIe lanes are not connected (only 2 or 1 usable)
reported to work on Huananzhi H12D-8D (no proof so far)

Thanks a lot for your comment. Thanks to your hint I'm finding that on Chiphell forum lots of chinese users seem to be using this cpu.
What would be in alternative the cheapest Epyc Milan with at least 32 cores and 8 memory channels?

 

[RolloZ170]

What would be in alternative the cheapest Epyc Milan with at least 32 cores and 8 memory channels?

alternative to a 95W 36 core ? this unit is cheap because useless(no PCIe GPU, no NVMe, no etc)
EPYC 7413 24 core should be enough.