Static pressure value? Higher the better?

[William Park]

Forgive my retardation, but I am trying to decide which fans to use on my Noctua NH-D15 (mainly because my build is literally all black)

I found the Industrial version of the Noctua P12 fans, the high pressure ones, and looking at the specs, I'm a little confused. It says its static pressure is 7.63 mm/H20. That far exceeds any fan I saw for comparison, ever. Compared to the Corsair SP120, which I always hear are great, it more than doubles the 3.1mm. Are Noctuas really that elite? Its got 109 CFM too, Jesus. Wouldn't these be THE perfect fans for radiators, if so why isn't everybodyyy using them? Price? Thanks for reading this

 

[Rhezner]

yes higher is better, High static pressure fans are best of heatsinks and radiators. High airflow fans are best for open spaces.

Keep in mind that those fans are quite loud, and you are trading performance for low noise.

 

[synphul]

Yes the higher the better. Also have to consider the specs of various fans, for instance if a fan like an sp120 is rated at 3.1mm/h2o, that's at full speed. Many people use them with pwm or fan controllers because they're too loud at full speed and as fan rpm's are reduced so is static pressure. Static pressure means how 'strong' the airflow is, does it meet an obstruction like cooler fins or radiator fins and find the path of least resistance or cause significant back pressure? Or does it continue to force its way through.

The noctua industrials are quite loud at full speed. If you want some real static pressure, you go with deltas. 5200rpm, 240cfm pushing static pressure of 27.48mm/h2o. More than triple the noctua's. Why aren't they used much? They won't run on a basic molex connector, better to wire them up yourself as they take 29.4w of power and operate at 62db which is the equivalent of a blow dryer, vacuum cleaner or power mower.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835213001

Case in point, though this guy had a great baffle box design that really did a good job of cutting the noise on his triple 480mm radiator setup.
https://www.youtube.com/watch?v=GSllkFWVhJI

 

[bonzer87]

Hi,

There are 3 thing about fan, Static Pressure, Airflow & Noise... Corsair have the SP (Static) & AF (Airflow) fan model. This fan are enhance to do a specific task in cooling your system. Noctua on the other hand have a better spec in all of this but they are not the top in the each of the category. It have a better overall performance. A wise thing to do is that you need to know what task that you want the fan to do before you bought it.