Originally Posted by JacekRing
the SP120's are definately nice fans....but they are like 13 dBA louder then the NF-F12's, draw 2.4W more. For an additional 8 CFM and 0.4 mm/H2O of pressure. I copied the stats below so you can compare. btw: the difference in watts for 6x fans running 24/7 comes to about 126 kW of power the SP120 will use more per year at 13.2 center per kW in PA, comes to $16.63 per year more expensive to run the SP120's. in 2 years of use the NF-F12's will save me money, even though they cost more.
Warning: Spoiler! (Click to show)
Static Pressure:3.1 mm/H20
Sound Level:35 dBA
Power Draw:0.25A (3.0 W)
Rotational Speed (+/- 10%):1500 RPM
Min. Rotational Speed (PWM):300 RPM
Airflow:93,4 m³/h (54.97 CFM)
Acoustical Noise:22,4 dB(A)
Static Pressure:2,61 mm H2O
Max. Input Power:0,6 W
Max. Input Current:0,05 A
edit: btw those delta's you linked are not PWM so they would not slow down during idle. I want it whisper quite unless I'm playing a game. Won't hear fans over the game anyway
Nearly all manufacturer specs need to be taken with a massive grain of salt. Fans on radiators and fan grills perform very differently to how they do in free air.
Noctua fans are well built and all but they don't work especially well on radiators. http://martinsliquidlab.org/2013/05/07/fan-testing-round-12/
At full speed the Noctua can put 500 fpm air flow through this rad.
The Corsair can put the same airflow through at lower volts of course, and still have a reserve of speed, and do it quieter.
The same holds true at lower speeds too. As far as power usage, the Corsair has a higher power usage rating because it is a much higher speed fan. At similar fan speeds the power usage of both fans would be so close as to be irrelevant.
Edit: I knew there was some info on fan power usage somewhere. The power usage for PWM version will be different because they don't reduce the voltage, and instead use an on/off duty cycle but they still use far less power than the rating.
For the same Airflow through the rad, the SP120 at 1600RPM uses 0.1 amps times 9V or 0.9 Watts
Of course none of that means there is anything wrong with using the Noctua fans at all. They still do the job fine in the end. It just can be deceiving relying on specs too muchEdited by Jakusonfire - 9/6/13 at 7:29am