I am looking at the Asus C621e Sage dual socket mainboard and its maximum memory capacity. There is conflicting information on the website, so maybe an expert here in the forums knows what we’re up against.
When checking the website, it says “max. 1536GB”:
However in the manual, it states that this amount of memory is available per CPU:
The latter makes more sense to me, but can someone confirm this?
I suggest you check the memory QVL list on the website and see if they list any 256GB LRDIMMs. If not, then I would think that 1.5TB is the maximum the board can support (12x128GB).
IIRC, 1st and 2nd generation Xeon scalable CPUs which work with this board come in two variants: normal that supports 768GB, and large memory (with an M suffix) that supports 1.5TB per CPU.
So, if 128GB per DIMM is the maximum supported, you can run two normal Xeons with 768GB per CPU, or one large memory Xeon with 1.5TB. If 256GB DIMMs are supported, then you may be able to run two large memory Xeons with 1.5TB each.
no conflict. Asus website is just stating a summary under marketing conditions.,while the manual has a breakdown of all types and supported sizes. It’s 1.5TB with 3D LR-DIMMS. Otherwise as listed. e.g. with standard RDIMMs you get 12x32GB
Always check the manual, never look for datasheets in marketing-centric websites
edit: max memory for boards and cpu is always calculated with expensive 3D LR-DIMMs and is pure fantasy in 99% of all cases
That is true, I’m looking into this because I’m trying to figure out how much Optane Pmem I can chuck onto the board. Would be great if it was indeed 2 x 1.5TB instead of just 1.5TB. The manual states 128GB LR DIMMS 3D support, but no more. But it’s still conflicting information in regards to the statement in the manual, where they say 1.5TB per CPU. I guess I will have to try it out.
DCPMM must be explicitly supported by the board, as it requires a UEFI configuration utility.
As I mentioned on your other post, these SAGE boards may or may not support Optane at all.
M, intuitively, stands for medium memory, not large memory. SKUs with an L suffix like the 6268CL support 4.5TB per socket. This value is the maximum sum of DCPMM + DRAM.
I had / have this board. You can put 12 Samsung LRDIMM of 128 ECC 2933mhz in it IF you use example dual 8280L
a friend of mine had his dual 8280 working with Samsung 256 LRDIMM, but had not populated all 12 slots.
both systems were on 8280L
So, the physical proof is inconclusive on using 12x 256 LRDIMM, but12x 128 LRDIMM works on dual 8280L
I have also seen it work at 12x 128 on 8180M with Samsung 2666 LRDIMM
Also please use latest bios, the last 2 bioses also support Resizable BAR
I hope that helps.
I have am old bench of the system when it only had 768GB of Samsung 2933 LRDIMM at
3rd from the top:
Thank you @rrubberr I can confirm that Optane does work on the boards, hence the second question as to what the mainboard limits might be. Will give an update once I have the 8275CL which is an amazing tip! Thank you! From what I understand, the Asus BIOS needs some modding to support these but it seems to be doable. At least for the 8273CL, I’m going to see if I can make it work for 8275CL SKU. Much appreciated!
That is a super nice machine, thank you for sharing. When I put in a 512GB Optane Pmem it also recognized it with the correct size, but it was limited by my CPU memory cap. I will publish the results once I have tested with a . Might take a while but will get back here once the results are in.
