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You might have shorted out one of the fans. The fan wires have to go outside the case, they're supposed to get threaded through an impossibly thin notch where the cards go. I broke the wires on one of my fans installing and removing the BMC board, but fortunately I caught it before powering it...

Use the BMC to upgrade to the latest bios. I also got platform error happens on old bios before doing that. If you get stuck on needing a key, google for an openssl commandline (or direct message me for help).

I don't but if it's the dodgy memory then it's still the platform's "fault". Memory fails, and apparently if it fails in a particular way I'll get absolutely zero diagnostics about it just silent crashes. :( Might some intel system do the same thing? Absolutely, but I haven't personally...

Yep. Zero problems at 2666MHz, however. It might well be that the H11Dsi is too picky, but I found that I was able to identify specific problematic dimms and they continued whatever socket they were in. I'm really disappointed that I wasn't getting any ECC errors, reduces my confidence in epyc...

64GB DDR4-2933Mhz LRDIMM Memory TSV Intel Skylake Xeon Scalable, AMD EPYC CPU | eBay

I've had similar experience on 64gb 2933 from this seller with a H11dsi (r2) board. For some reason I don't get any ecc errors that would help me locate the faulty ram, but after a couple days of sustained load I start seeing process crashes and memtest throws errors after running for a long...

2:1 mode needs 4 dimms per memboard. Each CPU has 4 memory interfaces each of which can be run at up to 3200MHz. There are two memboard slots per socket. 2 memory interfaces are wired to one memboard, 2 memory interfaces are wired to the other memboard which is why full memory bandwidth...

According to that paper only in lockstep (1:1) mode. 2:1 mode basically pairs up dimms to get double the speed (effectively 1333 becomes 2666 and 1600 becomes 3200), so it's faster even if it has to run at a lower clock. I'll check my systems later today. but it appears that the ones I have...

The system I tested above has 7 memory boards (mem1 rev2), in 2:1 mode running at 1600MT/s. 6 with 4 dimms, and 1 with 8 dimms. The cpus in the socket with only one memboard were 3% slower. This isn't exactly the test you wanted, but I think it's close. If you google up the fujitsu performance...

Per your question: I benched randomx on a quad socket 8880v4 (22core/2.2ghz) with xmrig in a system with mem1 boards and 1600MT/s memory. The result was 35213 H/s, or 400 H/s per core. On the system with one socket having only one memboard, it was 387.74 H/s on those cores, or about 3% slower...

Nope, though since I figured out that v4 cpus can be gotten to work with rev 1.02 memboards it's been less urgent for me.

You can max out the memory speed (pretty much) with 32 pcs of ram, 4 pcs per mem board and all 8 memboards. Some of the docs indicated that it could be slightly faster with 64 pcs of ram (8 per memboard) depending on rank and only with memory configs where the additional dimms don't force a...

If you have four mem boards, you can get all the perf available to you with 16 dimms. You'll get a memory bandwidth reduction from that config, if it'll be noticeable depends on your application. Make sure you put 1 mem board per cpu (every other socket on the motherboard).

Yes, with MEM2 or MEM1r2 officially, and with MEM1r1 in my experience (with 3 systems, and two different sets of v4 engineering sample cpus) but not officially supported.

I created a thread with the scoop on X10QBI and v3/v4 cpus: https://forums.servethehome.com/index.php?threads/x10qbi-and-v3-v4-cpus-e-g-supermicro-sys-4048b-trft.27636/

High core count v3/v4 E7 CPUs (as well as v2 for that matter) are often available at relatively low prices. A big reason the prices are low is that compatible boards are scarce, as they're quad socket parts that were only found in relatively exotic and high end systems. One of the most widely...

I just came across someone selling MCX516A-CDAT cards on ebay: Mellanox MCX516A-CDAT Mellanox ConnectX-5 100GbE DualPort Network Adapter QFSB28 | eBay They're asking $450, they took $400 best offers from me, but not lower. This is the lowest I've seen PCIe4 x16 dual 100gbe cards going for...

I'm looking for a single X10QBI-MEM1 Rev 2.0 memory board. If quantity are available I might be interested in as many as an additional 24 at the right price. (or, similarly, I might be interested in 8-32 MEM2 boards at the right price). I'm not interested in MEM1 rev 1.01 boards. These are...

The seller I bought the E7 v4 ES 20c/2.0ghz from doesn't have any more available right now, but I privately messaged you an offer on my extras because I upgraded. If you or someone else isn't interested, they'll end up on ebay eventually.

E7 is sadly a different socket than the ordinary two-socket E5 stuff. There is more discussion in this thread https://forums.servethehome.com/index.php?threads/so-i-picked-up-an-e7-8880v3-for-20-on-newegg.22226/#post-207145 Maybe there exists some two socket boards that will take E7 cpus, but...