I remember crunching under an IBM account -using even 80486 machines sometimes-, even before the year 2000...
These were our premium crunchers then:
Real 133/166 MHz Pentium monsters (then)...
These our 486 work horses:
We used them to robotize part of our tasks (password resets), as they were already old school then.
Being developpers we were not allowed the newest as our customers did not have the newest either. At home I was already using a K6III-400....