Windows Server 2012: two processors with different stepping?

Question

Supermicro

Hello colleagues.
Maybe someone came across:
there is a m.p. Supermicro X7DWU, dual processor, with Windows Server 2012 R2 x64 on board. We decided to add a second processor. The processors are both Xeon 5440, but one with C0 stepping, and the other with E0.
When both processors are installed, Windows does not boot, swearing at a processor error.
Separately, both processors work on this m.p.
Stepping support for m.p. yes, latest BIOS version.
The Internet writes that it is the Server 2012 OS that is sensitive to stepping.
Is it possible to still run such a configuration?

Answer 1

We ordered two processors from the same batch with the same stepping.
Installed, everything worked.
It is impossible, in general, different steppings.

Answer 2

Stepping actually points to the revision, the revisions are different for you. I'm surprised that it comes to bsod and the server starts at all.
Maybe something has changed in the modern world, but according to the recollections of the manual for some kind of bearded and very intersting piece of iron, it was written in black and white "identical processors in both sockets."