Normal Centrifuge
http://prntscr.com/wm1nxy

with 2 productivity 3

http://prntscr.com/wm1ouj

I am sure i can do math and normally the centrifuge has 4 polution per minute.
with 2 productivity3 it should raise by just 20% in total not over 200%.

Same goes for other maschienes like assemblers ...