Originally Posted by ElevenEleven
140mm fans are louder than 12mm fans at equivalent RPM. I would call 1000RPM AP-14s noticeable too (I own 6 of them). Good 140mm fans should have higher CFM than equivalent 120mm fans, so you can run them at lower RPM. Fractal Design R2s are pretty quiet between 5V and 7V.
Agreed for the most part, but Gentle Typhoons also have higher CFM for their RPM than most other fans (maybe all other 120mm fans below 2000rpm). It's why they're better on radiators than commercially-available 140mm fans. And while the R2 is quieter at 5V and 7V, the AP14 is quieter still. That
is what particularly bothers me: the R2s aren't great air movers in the first place, least of all through filters, and yet my several-hundred-RPM-faster GTs are still quieter. Of my fans, the only ones I have louder than my R2s are my Noctua P12s. They have a sound quality that just... bothers me. "Rough" is the best description I can think of.
(My Noiseblocker I can't really compare fairly. It's ridiculously quiet. Not good through filters either, but I can't think of a better exhaust fan. The only reason I replaced mine with an 800RPM GT is because the cable isn't long enough and I don't have an extension.)
Athlon, I strongly
doubt the R2s push that much air. My testing is pretty subjective but I've seen nothing to suggest it moves more air than my AP14s (makes sense since the AP14s are 400-500RPM faster) and the AP14s don't move 67CFM. Methinks the marketing department was pretty liberal with its estimate.