I think I know that you get airflow optimized fans, pressure optimized fans and others. My question: what are they all used for? Also, what are PWM fans?
I think I know that you get airflow optimized fans, pressure optimized fans and others. My question: what are they all used for? Also, what are PWM fans?
there you go
pwm fans are able to be controlled trough software
Actually, one of my Enermax fans is becoming a bit rattley and vibey, as I suspect the bearing is borked, so I'll have the absolute delight in buying another pair of shiny new Noctuas come payday.
I know only one Enermax has gone, but I have to replace both.... ya know - Just in case... !!
I have a pair of 120mm Noctua NF-P12 fans as exhaust fans - sprayed gloss black as I can't stand their stock colours and with the back lugs removed so I could install them. Input into the 'case' is a single 200mm NZXT 11 Blade Rifle Bearing fan, also sprayed. The idea is to minimise noise and maximise air throughput.
Fans are an awkward one, there's so many factors and variations involved and no standard tests/testing procedure, which means you cannot rely on any brands/manufactures claims or compare there listed air flows against each other.
airflow optimized vs pressure optimized depends on where and how you plan to use a fan.
Basically pressure optimized means the fan can push the air through small spaces or past restrictions better than airflow optimized fans.
Case fans that exhaust air should generally be "airflow optimized" fans and heatsink/radiator fans should be "pressure optimized" fans.
Case fans that intake air could be ether, depending on the case and the overall fan layout.
The RPM speed of a fan is also another factor esp in "static pressure" (the ability of a fan to push air into an area of higher pressure that is pushing back against the air flow)
Air flow cone is yet another factor, narrow or tight? how much turbulence and micro-turblence there is in the cone, how much does it matter for the fans position?
Fan's and air flow dynamics is one of those things that can get crazily complex the more you dig into it.
PWM is Pulse-width modulation, basically it's a way to control the speed of a fan.
Most basic fan controllers work by simply reducing the voltage being feed to the fan, thus slowing down the motor, PWM pulses the current flow to the fan to slow the fan down instead.
Again it gets more complex the more you dig into it.
Basically if your motherboard has 4pin PWM fan headers then it can use them to control the speed of a PWM fan that's connected to it and it does it automatically depending on it's settings, allowing it adjust the fan speed based on temperature.
This is good because of another basic thing about fans, rpm=noise+air flow, yes there are other factors and some fans are better than others, however the case that the faster a fan is the more air flow and the more noise it makes is a fairly basic rule for all fans.
Again Should be noted that some fans lie about their speed, eg I had some old turbine style fans, that used to report twice their actual speed, they claimed 2800rpm because they had twice the number of blades of a normal fan and it was easy to see that they where only running around 1400rpm
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razer121 (16-10-2014)
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