2000RPM at 19db noise fan

Computer fan manufacturers tell blatant lies. Don't buy these thinking they'll be quiet.

They're 19dBA btw, not 19dB. So sound level was recorded at an unspecified distance at unspecified background level, passed through an unspecified filter and then averaged somehow as 19. It's a completely meaningless number.

If you want the best air cooling practical bulldog, you want two 38mm san ace fans, running from a fan controller.
 
dBA means at ambient. This may be ambient for a "normal" computer, which may already be pretty darn loud. It *may* be ambient as in normal life sounds, which you may always hear.

Basically, never go by these numbers. The only way you can truly tell how noisy they are is to find a review from a reputable website or something.
 
There is no silver bullet with fan noise. If you want to move air it going to make noise, if you want to move a lot of air you will make a lot of noise.
 
From my own experience I would say be very wary of manufacturers specs.

I bought several fans before with quoted 20dba or thereabouts figures only to find them louder than anything else in my case! So loud in fact that once tested, they were quickly removed and resigned to the loft.

The only fans I have personally purchased that stood up to their claims were the Noctua fans. Decent airflow and very quiet, albeit at a premium price. Although even those I reduce to around 800RPM to suit my taste.

As said above though, if you want a lot of airflow, you will have noise along with it. But with better fans like Noctua this noise literally sounds like the air wooshing, rather than the high pitch whining or other mechanical noises that lesser fans can produce at similar airflow.
 
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