EPYC 7763 differences? 100-000000312 vs 100-000000314-04

Difference between EPYC processors of same base name?
I have seen both
referred to as EPYC 7763

Many more listed here

The -04 designates what is called a QS, Quality Sample, which is a step up from ES (Engineering Sample).
The QS chips are much better motherboard compatibility while ES are very tricky and most of the time will work on Supermicro motherboards with old BIOS revisions.
The QS chip will be slightly slower than the retail version.
For example, I’m running an 100-000000053-04 (100-000000053-04_32/20_N to be exact), which is the QS edition of the 7742 64c.
The 32/20 at the end designates 2.0GHz base, 3.2GHz boost.
The retail 7742 is 2.25GHz base and 3.40GHz boost.
So the QS is slightly slower.
The QS can also be regarded as an OEM chip sold to major data centers, Amazon, or Dell.
Another option the QS chips have is overclocking ability which the retail chips do not. You can find more info here: Finally: Overclocking EPYC Rome ES | ServeTheHome Forums
The thing to keep an eye out is the -04 chips that are locked to Dell, which means they cannot be used on any other motherboard except a Dell motherboard. Might be also Lenovo or HP locked, but Dell is most popular on eBay.
So, you might be able to save a few on a -04, but always read the sale description, some sellers will tell you which motherboards they’ve tested them in.
There are also -05 variants, but they are not overclockable, only -04.
Hope this helps clear things up.

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I am using a AMD Eng Sample: 100-000000894-04 on a Supermicro H13SSL-NT so I assume ymmv. Where does AMD state what the numbers mean? I’d love to read through

I haven’t seen any identification explanation chart, all I know is the -04 is the only that is overclockable, there is also a -05 which I’ve seen on eBay but no idea if it can be overclocked or not.
I think I’ve seen -03 on eBay as well but they are not overclockable as far as I know, only the -04.
I think the -0X chips are referred to as ‘QS’ samples, so they are better than ‘ES’, but a bit slower than retail cpus.
As far as I know the ‘QS’ chips do not miss any CPU features (so they are just like retail except lower frequencies), while ‘ES’ chips might be missing CPU features.