How to connect a 2 pin case fan ( Deepcool Xfan ) to PSU?

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Anawin Famadico

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Oct 4, 2013
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Hi. Can I connect my 2 pin molex case fan directly to the 4 pin molex of the PSU? Is it safe? If not, can you please teach me how? Thanks. I'm still a newbie in connecting case fans=))
 
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photonboy
You can get case fans that are very quiet but only spin at one speed. Obviously you can't ramp up further as things overheat but for many people that's quite sufficient.

1000RPM or below is generally very quiet though it depends on the fan quality.

You can find 4-pin (PWM) or 3-pin (Voltage) controlled fans for as little as $12 through PCpartpicker or wherever that are pretty good. Then attach them to the motherboard so the fan control software can spin them.

Note most fan control software won't go below 40% of the fans max specs which means if the fan was say 600RPM to 2000RPM (variable) the lowest you'll go is 800RPM. That's not too bad but if your fan could go up to 3000RPM then the fan is going to start getting noisy even at its...
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photonboy

photonboy

Titan
Jun 20, 2006
21,567
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It's not harmful in the slightest. Also, many fans can only run at one speed anyway.

Regardless of how you connect a fan, it must be a "variable" fan to be controlled such as "500RPM to 1000RPM" and not 1000RPM plus or minus 10%.
 
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Dawis67_AE

Distinguished
Jul 9, 2014
396
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18,815
I have 4 fans connected to fan controller. Lowest i can get them is 40%. And when gaming i have to click 6 times to get to 100% for each fan. I have 3 stock fans and 1 i bought extra. It makes terrible noise though and its loud. Its just fucking annoying
 
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photonboy

photonboy

Titan
Jun 20, 2006
21,567
13
85,015
You can get case fans that are very quiet but only spin at one speed. Obviously you can't ramp up further as things overheat but for many people that's quite sufficient.

1000RPM or below is generally very quiet though it depends on the fan quality.

You can find 4-pin (PWM) or 3-pin (Voltage) controlled fans for as little as $12 through PCpartpicker or wherever that are pretty good. Then attach them to the motherboard so the fan control software can spin them.

Note most fan control software won't go below 40% of the fans max specs which means if the fan was say 600RPM to 2000RPM (variable) the lowest you'll go is 800RPM. That's not too bad but if your fan could go up to 3000RPM then the fan is going to start getting noisy even at its lowest speed.

If the case fan isn't very noisy and you have no heat issues then I'd just leave it alone though.
 
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