Have you actually used a 7D12/7D13 before tho? Most likely not. I have had the exact same problems with my 7D12 at first and got it for cheap because "it wasn't working". Guess what? It did work just fine.
It's very simple: AMD does not create custom steppings or microcode for these SKUs, so all of them (yes, all of them) will work in regular EPYC boards as well (granted you have a board that supports Milan). You just have to find the right configuration because something about these SKUs is different from a normal variant (PCI-e lanes, memory channels etc.)
I'm quite busy at the moment, but I'll try to give you a rundown of things I've done to get my 7D12 to work in 2 weeks or so.
Perhaps you shouldn't spout pure guesswork and speculation contrary to known public information. There are two known variants, 7D13 and 7V13. Neither are 'OEM' parts. They are contract customer parts. Unless your name is Jason Zander, Mark Papermaster or Dr. Lisa ****ing Su, you know absolutely zero about what AMD can and does offer contract customers. Whereas I do know for a fact
just from public information that 7V13's have some level of unique microcode.
Here, I'll give you a free hint.
And since you aren't the CEO or even an employee of AMD, you most definitely have no right much less the least capability to speak for them as to what they do and do not do.
Not to mention the complete absurdity of your delusional insistence that this is a Dell part or even a standard OEM part. If this is a Dell part, then please do explain why not a single Dell system or Dell customer or any
customer has found a single one of these "Dell OEM" processors when they've been shipping a full year. Go on. I'm waiting to hear how out of more than 20 million systems shipped in just the first 6 months of 2021, not a single one of them received this part or ended up on eBay or some other reseller. Or anywhere at all within Dell's ordering system.
Seriously. Explain how it is that out of who knows how many hundreds of thousands of Dell EPYC servers that have shipped, not a single one in the entire world has a "Dell 7D13."
but my chineese CPU supplier sells 7D13 too and says this CPU currently don't work on standard mainboards.
Yeah, and I'd bet they aren't getting them from Quanta's loading docks either. I'd bet money these are coming from whoever's building Project Olympus boxes, which has been very
hard to track down. The only thing known for sure is that the production parts use really, really brown FR4. Like, baby poop brown, not retro brown.