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>I can never remember what xnm means as it varies between companies.

Intel has renamed their node so the industry has now pretty much standardise on naming. Where all 3nm from Samsung, TSMC and Intel will have similar transistor density. ( But not similar performance or any other characteristic )

Officially Intel doesn't use 4nm or 3nm, they call it Intel 4 or Intel 3. But for the sake of easier comparison most people still use Intel 4nm to describe it.