Resistor between PSU and fan?

[grandpatzer]

I want to replace my PSU fan, however the new fan is way too high rpm at 12v.

I wonder if it's possible put a resistor between Fan and PSU?
I know this can be done for motherboard, not sure about PSU?

 

[SPS]

A PSU would surely control the speed of the fan?

 

[grandpatzer]

A PSU would surely control the speed of the fan?

yes but I think adding a resistor I'm able to decrease the 100% rpm, so let's say a fan is 1700rpm at 100%, adding a resistor between a motherboard and a fan makes this 1200rpm 100%.
So instead of 1200-1700rpm, I get about 700-1200rpm which is quiet when surfing the web.

I'm not entirely sure if this resistor is recommended putting between PSU and fan similar to Mobo and fan.

 

[Feronix]

Why don't you get a low-RPM fan? Would save you the hassle of doing stuff like this, lol

 

[airdeano]

it is if you have an older non-fan speed reg'd PSU.

you'll just wanna make sure the splice is well insulated from accidental short or
grounding.

in the older days i routed the fan cable outside and ran it through a fan
controller (ewww) or ran from motherboard before i knew better.

 

[dragoonk]

Yes it's very possible but you will have to make some calculations, and find out some values like the fan's Amps, there are a few formulas you need to know... or you can just take a bunch of resistors and try them one by one and see which one you like ( worked for me, was much easier then spend time and calculate ) . It might keep the grinding motor noise it makes when it's on full 12V so it also depends on the fan.

 

[grandpatzer]

The PSU has PWM fan control.

So I guess a 1200rpm fan would perform 500-1200rpm depending on load?

the original fan is very powerful 0.50A and 12V = 6watt.

I have 2 choises: Noiseblocker PK-2 and PK-3

I have read that the PK-3 is very noisy at 1700rpm (not sure what rpm it would be at idle).

So If my PSU does not need more then 1200rpm then the PK-2 should be enough.