That depends on
how tight everything is. Thermal Conduction Module, anyone?
At 1ns/ft even the TCMs were not tight/dense enough.
Have you ever seen a IBM TCM?
Crunching numbers was a part of the task. The other
part was moving
and handeling data in mass storage and memory. Most of the DEC hardware
moved data pretty fast. What was the demise of PDP-10 was simple, megabytes.
And being six bit machine in an eight bit world...
--
Will