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Will these be able to be used in multi-cpu systems? Will you be able to build a 56 core computer?

Currently you can buy a quad-cpu Xeon Platinum 8180 setup with 28x4 cores.

Most likely under the Xeon brand

IIRC top models from last i7 Extreme generation and i9 have support for dual-cpu systems.

No only Xeon E5-2600 V1-4 series (Dual Socket) and Xeon E5-4600 V1-4 series(Quad Socket) are multi-cpu capable.