Just got it from ebay and it has no EPYC logo on the surface.
Is it an ES version?
Thanks for help guys.
EPYC is a Server CPU thus the best place to ask your question is here: AMD Server Gurus .
Users there would be familiar with EPYC CPUs and might be able to advice and answer your question.
EDIT: Yes it would be a good idea to contact AMD EMAIL SUPPORT. AMD Support will probably want to know the Serial Number and upload a photo to determine if you have a legitimate EPYC ES CPU.
Found this at a Website that shows EPYC ES photo and a regular EPYC from AMD: AMD EPYC 7601 an Engineering Sample - how does it look like? | ServeTheHome and ServeThe.Biz Forums
From the link in the image from Ebay: AMD 32 Core 1.9 GHz EPYC CPU Engineering Sample 2S1905A4VIHF4 Gigabyte MZ31-AR0 | eBay
Does your EPYC ES CPU Look like this one?
This was my post on ServeTheHome.
So, what I have founded out:
The first-generation (Naples) EPYC CPUs could be without an "EPYC" label on the lid if the CPU was produced before the certain date (early-produced CPUs). So, they don't have an "EPYC" logo on the lid, but it's the only difference. They're the same like the ones with a logo. And this refers not only to 7601. See the attached picture.
ES/QS CPUs usually have a writting or a sign on the lid that shows it's a ES/QS.
You can also find it out in BIOS, CPU-Z or hwinfo utilites. I have tested CPUs with no and with an "EPYC" logo on the lid , so, if BIOS/CPU-Z/hwinfo shows it as a production unit there's no difference at all.
I might be able to help. I am part of a small group who might be able to help figure this out if you are willing to run some tests on it. It might be worth it to look at CPU-Z to see what it says. If it is an engineering sample, that's awesome. That means you can probably overclock it if you wanted to. 
