I have 2 corsair fans - neither are quite what I want

McGraw · 19 Dec 2014 at 15:35

So I have a high performance 120 non PWM fan and a quiet 120.

What I now realise I actually want (long story but I haven't paid for these fans) is a PWM high performance...I think.

Without buying another fan, is there any way I can make the quiet run faster or somehow control the non PWM as even undervolted the HP is far too loud.

I can't have a front mounted controller and I don't really want any form of controller.

Highly doubtful but is there some way to combine their parts into what I want.

Don't want to sell them in case the pwm hp is too loud.

Thanks a lot.

Tealc · 20 Dec 2014 at 12:53

If you apply a higher voltage to the quiet it'll run faster. It will also probably fail early. So basically no.

As for the HP the only easy way to quieten them is by reducing the voltage. Most fans will respond to a lower voltage until around 5v or so.

McGraw · 20 Dec 2014 at 16:25

Thanks.

Is it possible to undervolt more by modding the undervolt cable?

Mick-1965 · 20 Dec 2014 at 18:37

What voltage are you trying to obtain ?

Lowest you can go without using a fan controller is 3.3v Orange wire from your psu and obsviously any black as a ground.
Not many fans will start at 3.3v though

McGraw · 20 Dec 2014 at 22:15

Mick-1965 said:
What voltage are you trying to obtain ?

Lowest you can go without using a fan controller is 3.3v Orange wire from your psu and obsviously any black as a ground.
Not many fans will start at 3.3v though

Not sure to be honest. Just something less than the 7v than the supplied cable gives you.

I might try that thanks.

Mick-1965 · 21 Dec 2014 at 00:16

list of voltages you can get from a standard psu

12v yellow and black
8.7v yellow and use the orange to connect the fans negative connection
7v yellow and use the red to connect the fans negative connection
5v red and black
3.3v orange and black

Mick-1965 · 21 Dec 2014 at 00:40

A down and dirty way to fine tune your voltage to your fan.( without fan controllers )
You can put diodes in series, each diode will drop you roughly 0.7v
Something like 1n4001, cost you 15 pence each from maplins.

ie 12v going to your fan normally, put 3 diodes in series on the positive side of your fan and it will run at ~9.9 volts
Just make sure you put them the right way round ( the line on the diode(Kathode) should all be facing towards the fan )

McGraw · 21 Dec 2014 at 14:19

Thanks.

I've got some diodes, will check out their rating.