"What made the 1960s CDC6600 supercomputer fast?"

An analysis here of the logic architecture of a very important machine - running at 10MHz in 1964, and of course using discrete transistors throughout - just one transistor per logic gate:

See also the discussion on HN.

Edit: and see also the web page The CDC 6600 Architecture which has more good links.

via @wazoox on diaspora and also via the TTLers chatroom on hackaday.io