120mm Best replacement heatsink fan for CPU ?

[pcslookout]

15 mm or 25 mm doesn't matter. Which is better btw ?

 

[pcslookout]

Just ordered a Noctua NF-A12x15 PWM premium-quality quiet slim 120mm fan from Amazon! Can't wait! Nearly double my current CFM!

 

[aigomorla]

not the best fan for a heat sink...

If i had to get a noctua for a heat sink this guy would be my second pick over a gentle typhoon.
http://noctua.at/en/products/product-line-industrial/nf-f12-industrialppc-2000-pwm

This is my first pick.
https://www.coolerguys.com/collecti...-series-d1225c12b-1450-1850-2150-and-4250-rpm

the 2150 model is PWM.