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Fan speed 101 for n00bs :P Help! plz

post #1 of 5
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okay so my NZXT case sounds like a bus at night. and i dont have a fan controller in the case so does that mean i can't control the speed of the fans? lol I really hate it win all fans are on 100% when I need to check facebook lol.

Also, can someone direct me to a link that teaches you how to measure the size of your fans? lol
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post #2 of 5
do you have your fans plugged into the motherboard headers or via molex?

you can always buy something like this too:
http://www.newegg.com/Product/Produc...-011-_-Product

i have that in black and it works great controlling my 5 120mm case fans + 2 120mm radiator fans.
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post #3 of 5
He probably has them all plugged in through his Power Supply.
There are 2 solutions for you, either plug all your fans on the motherboard headers or buy a cheap fan controller to control your fans.
Motherboard headers control fan speeds based on the temperature of your computer. When its idle, it goes down. When full load it goes up.
With a fan controller, you can ultimately decide the speed of your fans manually.
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post #4 of 5
You have other options as well, but they require a bit of mechanical ability. You can swap the wires around in the fan's connectors, so the fan is connected to the +5V and ground, rather than the +12V and ground. That will run the fan at a little less than 50%, is completely free, and is actually pretty easy to switch back.

Another option is to wire a resistor into the fan's wire. To figure out which resistor you need is a bit tricky- Say you want the fan to run at 75% and guesstimate that it draws 5 watts (which is on the high side, but if your fans are loud it's probably accurate.) Watts = Volts * amps means that your current is 5/12 or ~.42 amps. (Still with me? ) For our example you want your voltage at 75%, and Voltage=Current * Resistance, and assuming the current will stay approximately the same (it'll be close enough) 12v * .75 = .42 * resistance, solving that for resistance gives us ~ 21 ohms. You'd want to use the big, 5 watt resistors and not the little bitty .25 watt ones. Also, you'd probably want to get a range of resistors around the value you came up with since we just guesstimated everything, so for our example I'd probably grab a 15, 20, and 25 ohm resistor. The lower the ohm rating, the faster your fan will turn. Be careful cranking it down too low though, once you get below 4 or 5 volts your fans will have trouble starting.

That, or you could just buy quieter fans. 1200rpm or less is a good point to shoot for.
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post #5 of 5
If you have the fans all plugged in to the motherboard, you should be able to change their speeds (Speedfan, HW Monitor Pro, etc.).
If not, get a fan controller like fazio's. If you want something PWM based (automatic control based on case internal temperature), you can try the Sunbeam Rheosmart 6.

Or what that ninja said.
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