Different processors on a dual socket motherboard ?

I have a server with ONE processor, but could it can handle TWO

Has anyone "mixing processor types" instead of
having them both identical on Windows 2012 R2 ?
states the below
1. CPUs must have the same QPI and RAM speed to work together.
2. CPUs must have the same thermal profile (TDP) to work together.
3. The CPUs must have the same number of physical cores to work together.
4. The CPUs must have the same number of logical cores to work together.
5. Stepping does not matter.
6. Clock speed does not matter.
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PowerEdgeTechIT ConsultantCommented:
What brand server do you have? It's possible (but unlikely) that there exists a one-off board capable of accepting slightly different specs, however, If not 100%, I'd guess 99.99% or more of boards will not accept mixing different CPU's. Clock speed and stepping certainly does matter.
Mixing different CPU's on a multi socket board won't work.
That Intel say it is a valid combination doesn't mean that the motherboard BIOS will enable it.

There is some sense to it being possible to run different clock speeds processors (at the lower clock speed) on a single board, after all Intel/AMD do not have one fab that made 5504s and another that made 5506s, they're both made on the same machine using the same mask. After production Intel test them to their limits and the ones that crash when run at 5506 clockspeeds are put in the 5504 bin. You may even see "new" chips appear a year or so after the bulk of the new chip models get released, this is due to "deep bin sorting" where just a few chips run a tad faster than design spec and the manufacturer saves them up until they've got enough in the bin to release them. (you know about deep bin sorting already from a previous question).

After they take the chips out of their selection bins they stamp the part number on the outside and burn a similar label onto an embedded ROM so the BIOS can see what chip it has fitted.
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