Did I do the 7V fanmod right?

Vegeta · 12 Jul 2006 at 13:36

Hi, I just did the 7V fan mod on some silenx fans (I know quiet as they are I could still hear them).

i did it using this guide

http://www.cpemma.co.uk/graphics/7v.gif

The fans both had these 4 pin connectors and I did it to bother.

But I clipped them both together and one end into the PSU - does that mean the first one connected to the PSU is running at 7V and the one after that running lower?

Yewen · 12 Jul 2006 at 13:39

Both at 7v.

Same as if you add a fan in before a CD drive, the CD drive will still use 12v.

Vegeta · 12 Jul 2006 at 13:43

Cool, completly unaudible now, but pushes hardly any air lol, but didnt seem to effect temps much, will be installing more fans anyways.

Vegeta · 12 Jul 2006 at 13:50

Is there anyway to mod a fan to run at 7V if it only has 3 pins and not the 4 pin molex connector?

Mikey1280 · 12 Jul 2006 at 13:56

Some 3 pin to 4 pin adaptors allow you to do this, not all though.

Vegeta · 12 Jul 2006 at 14:06

No I mean is there anyway to just mod the end that goes into say your motherboard.

Raikiri · 12 Jul 2006 at 14:16

Vegeta said:
No I mean is there anyway to just mod the end that goes into say your motherboard.

Yes, plug the end into a fan controller

You need to use a molex as it is the only connection (afaik) that has the -5 and 12 voltages.

Mikey1280 · 12 Jul 2006 at 14:16

If it was plugged into your motherboard you may be able to use speedfan to control it.

samcat · 12 Jul 2006 at 14:20

Resistor soldered inline...

You can also buy speed reducer cables for 3 pin fans... They have a resistor inline.

Cheers,
Sam C

Yewen · 12 Jul 2006 at 14:25

samcat said:
Resistor soldered inline...

You can also buy speed reducer cables for 3 pin fans... They have a resistor inline.

Cheers,
Sam C

Exactly, Zalman ship their fans with these reistor adapters, but they dont work that well, only about 10v ish.

samcat · 12 Jul 2006 at 14:45

Yewen said:
Exactly, Zalman ship their fans with these reistor adapters, but they dont work that well, only about 10v ish.

My resistors drop down to about 6.5v... But I experimented with a variable resistor first until I found a noise/airflow level I was happy with... Measured the resistance at that setting and bought some resistors that were similar.

Cheers,
Sam C