Originally Posted by
Vapor
I used Ultra Kaze 2000 for the 2000RPM fans....I've compared the Panaflos to the Ultra Kazes in my fan reviews and they're pretty comparable in terms of radiator performance....Ultra Kazes actually have less airflow loss (as a percentage), but seem to get a little louder on the radiator though, which equals out the higher airflow.
Incidentally, the San Ace is a pretty poor performer on the radiators in terms of airflow, but it also gets quieter (probably lowers RPM in a high-impedance environment via current sensing), so it equals out :)
(and yeah, difference between 1600RPM S-Flex Push/Pull and 2000RPM UK Push/Pull is minimal...much above 1600RPM on these HSF in push/pull definitely has poor scaling in terms of noise efficiency)