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Does anyone know what the tester for a 12-core 3 GHz processor looks like now?

Don't know what the latest is, but this from Teradyne was probably close: https://www.teradyne.com/products/ultraflexplus/

Interesting, looks expensive

And I mean "chip factory expensive" not "Regular Joe" expensive

Potentially the processor has Built-In-Self-Test (BIST)? Connect up the JTAG bus, send the right commands and the chip tells you that it is okay.