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AM5 ECC support£

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ApplesOfEpicness View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote ApplesOfEpicness Quote  Post ReplyReply Direct Link To This Post Posted: 03 Nov 2022 at 10:11am
For anyone curious, I have been trying to get ECC to work on ASUS's and ASRock's ITX boards to no avail. However, I have managed to reach out to an AMD engineer, who has confirmed that the issue is on their end, and they are targeting a fix to release in AGESA 1004/1005. No ETA on when they will be available, but at least we know it is an AMD problem/
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SkyBeam Quote  Post ReplyReply Direct Link To This Post Posted: 06 Nov 2022 at 1:57am
Originally posted by ApplesOfEpicness ApplesOfEpicness wrote:

I have managed to reach out to an AMD engineer, who has confirmed that the issue is on their end, and they are targeting a fix to release in AGESA 1004/1005. No ETA on when they will be available, but at least we know it is an AMD problem/


Many thanks for the update. So as of my understanding ASUS claiming official ECC support but it does not work currently and ASRock seems to have removed advertisement for official ECC support. Both are not supporting it currently in practice.

So if ECC support is going to be in future AGESA updates there is hope that all/most AM5 mainboards will support ECC in the future. ASUS essentially need to as they advertise ECC support and ASRock might be changing their minds as soon as support from AMD finally works.

So let's wait a bit for the upcoming AGESA releases and how mainboard manufacturers will support ECC. Perhaps you can perform the same test again after both manufacturers released updates.
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Post Options Post Options   Thanks (2) Thanks(2)   Quote ApplesOfEpicness Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2022 at 11:03am
Update from the engineer. The fixes are committed for AGESA 1005. They guess it will come out sometime in Feb 2023.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jekle Quote  Post ReplyReply Direct Link To This Post Posted: 17 Dec 2022 at 4:59am
Originally posted by ApplesOfEpicness ApplesOfEpicness wrote:

Update from the engineer. The fixes are committed for AGESA 1005. They guess it will come out sometime in Feb 2023.

Good to hear, was about to need new PC-s early spring.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DemonAk Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2023 at 3:02pm
Future bioses will support 64gb ecc modules like these?:
https://product.skhynix.com/products/dram/module/rdimm.go
HMCG94MEBQA109N
HMCG94MEBRA109N
HMCG94MEBRA123N
HMCG94MEBQA112N
HMCG94MEBRA121N
HMCG94MEBQA123N
HMCG94MEBRA112N
HMCG94MEBQA121N
it would be great if we can to put 2 modules 2x64gb 4800MHz and overclock them, because today 4x32gb (ddr5 4800 and above) udimm do not work well at frequencies above 3600MHz
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Post Options Post Options   Thanks (0) Thanks(0)   Quote eccential Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 2023 at 7:51pm
Those are all Registered DIMMs. Ryzen won't ever support them.

But I believe we'll end up with 64GB unbuffered DDR5 DIMMs at some point, just as we got 32GB DDR4 DIMMs some time after DDR4 became the major player. Asrock's spec page for X470 Gaming-ITX/ac still says max supported memory is 32GB (16GBx2), but I'm running mine just fine with 32GBx2, so there's that.

Back in the early days of DDR4, the only ECC UDIMMs I could find were 2133MT/s. Nowadays, 3200MT/s is the norm. So I actually want to wait for at least 5200MT/s JEDEC to become the norm for DDR5 ECC UDIMMs before I jump in.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote jekle Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 2023 at 8:36pm
AGESA 1005 bios is downloadable but no update in specification about ECC support yet.
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Post Options Post Options   Thanks (2) Thanks(2)   Quote ApplesOfEpicness Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2023 at 10:01am
I did some testing with the new BIOS and can confirm ECC is working. https://imgur.com/a/w2jNLNg
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jekle Quote  Post ReplyReply Direct Link To This Post Posted: 27 Feb 2023 at 12:55am
Good info! Could you expand on what UDIMM module nr and how did you inject the errors?
I suppose then every Asrock X650 and X670 MB with AGESA 1.0.0.5c BIOS then would work if not missing physical parity traces from socket (is there any such?)
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Post Options Post Options   Thanks (2) Thanks(2)   Quote ApplesOfEpicness Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2023 at 9:36am
I am using these modules in the Asrock B650E ITX board: KSM48E40BD8KM-32HM. The way I injected errors is really janky and I don't recommend doing it if you don't have steady hands/don't want to risk your hardware. I just took some tweezers and shorted a data pin to ground (287 & 286). I did the same with DDR4, as well as earlier last year to figure out that ECC wasn't working on AM5, so it wasn't too bad. The BIOS seems to have some ECC injection settings, but I have no idea if they work or not. Memtest86 doesn't seem to be updated yet so I can't try it.

Pinout for reference: https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/modules/unbuffered_dimm/ddr5/ddr5_udimm_core.pdf?rev=fdbd9476506c4e019360a5e402827caa
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