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AM5 ECC support£

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jekle View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jekle Quote  Post ReplyReply Direct Link To This Post Topic: AM5 ECC support£
    Posted: 01 Mar 2023 at 11:23pm
Shorting data pins sounds really good robust idea for testing. I would've thought to start overclocking or messing with timings to try to get non-crashing bootable state but at the same time with some errors but this balance is hard to achieve. Bios injection settings have not worked before if I remember correctly that there were some on AM4.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote eccential Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2023 at 8:40pm
You rock, ApplesOfEpicness!

I've been thinking B650D4U for my next build, along with 7800X3D, but I really prefer the B650E-ITX for my use. And B650D4U probably won't even be available until 2H of 2023.

I highly doubt AsRock would re-design the whole board to remove traces for the DIMM slots, so looks like things are looking good for B650E-ITX. I wonder if AsRock would restore the ECC support in the spec pages....
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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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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: 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 (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 (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 (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 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 (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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