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7nm is really just a node name. Gate length is probably about 20nm. Still very impressive though!

The gate pitch is 54mm for TSMC and 56nm for Global Foundries @ 7nm.

That's the distance between gate midpoints, not their characteristic dimension.

> 54mm

Typo for nm, presumably :-).

The funny thing about 54mm is that this is pretty close to the original gate pitch, back when we had to use vacuum tubes or relays.