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by fulafel 4214 days ago
Intel was relatively late to the game, their multiprocessor support started getting decent around the Pentium Pro. The Unix workstation vendors (Sun etc) had dual CPU workstations a while earlier, but mostly SMP was used in servers.

https://en.wikipedia.org/wiki/SPARCstation_10

Feather in the hat for first multi-core CPU on single die goes to IBM and the Power4 in 2001, preceding Intel's attempt by ~4 years. (Trivia: IBM also sold a Power4 MCM with 4 Power4 chips in a single package).

(Yes some people managed to stitch together earlier x86 processors too with custom hardware, but it wasn't pretty or cheap or fast).