Volt Modding a fan question

xirokx · 10 Apr 2006 at 18:41

Hi,

I have just bought a random 80mm fan that runs at 12v 36cfm 34dba....

I'm sure I read in one of your guides yewen I can get the same cfm and dba at 7v?

Is this true or am I a confused bunny?

Please advise

Cheers

Raikiri · 10 Apr 2006 at 18:46

Why would you run it at 7v for the same noise and performance? :/

You 7v it in order to lower the noise it produces, which will also lower the airflow.

RandomTom · 10 Apr 2006 at 18:46

Lower DbA and lower cfm on 7v as it's just providing less power than at 12v, it's generally better for noise to 7v

Yewen · 10 Apr 2006 at 18:47

The stats the makers give you are never acurate, and are a very rough guideline.

If you 7v the fan, you usually loose a lot of the noise, and only a bit of the performance. To me it is a great tradeoff.

There is a guide in the sticky under V for doing the mod.

Hope I have got it right with my response, let me know if its nothing like what you were after

(You stick YEWEN in the title, and everyone replies :cool:

)

xirokx · 10 Apr 2006 at 18:48

ahhh...I got it....

Where is that guide? I remember seeing it whilst surfing around the other day

Also is there much difference in air flow and noise levels if I was to reduce the voltage to 7v?

Yewen · 10 Apr 2006 at 18:48

The noise will go down a lot, and the CFM only a little usually, each fan is different.

Try it and see.

Its in the sticky: http://www.cpemma.co.uk/7volt.html

xirokx · 10 Apr 2006 at 18:57

cheers matey

Unfortunately my case fan has three pins only I do have the four pin connector but dont use it....

Am i stuffed?

Raikiri · 10 Apr 2006 at 18:58

use the 4 pin then?

xirokx · 10 Apr 2006 at 19:03

where does it plug into on the mobo? or a female connector wire type thingy off the PSU

Raikiri · 10 Apr 2006 at 19:05

molex connector from the psu

xirokx · 10 Apr 2006 at 19:06

how many molex connectors does 1 psu have?

I mean I have 2 case fans

Sorry just thought I would ask here before opening up the pc

I have an old psu but do they all have same number of molex connectors?

Raikiri · 10 Apr 2006 at 19:11

It varies, some have 4, others can have 10. You will have to look

Yewen · 10 Apr 2006 at 19:50

Usually quite a few as raikiri says, you can also daisy chain them if your adapter supports it.

xirokx · 10 Apr 2006 at 19:59

should the blades for the front fan be facing the front and the blades with the protector at the back? dya know what i mean?

Unfamiliar with daisy chaining...

I have molex connectors which my fans can connect too however does the three pin connector apart of the 4pin adaptor that came wiv my 80mm fan then connect to the mobo or does it stay loose?? Basically once I connect the 4 pin adaptor to the 4 pin molex connector do I have to worry about plugging the three pin in anywhere???

Yewen · 10 Apr 2006 at 20:04

It is used to monitor speed (the 3 pin connector dangling) so plug it in if you need to monitor speed.

Daisy chaining is just pluggung a molex into the back of your adapter, as it may have a female connector on the back.

The fans direction, there is usually a arrow on the side of the fan showing which direction the air blows. If that is what you are asking?

xirokx · 10 Apr 2006 at 20:24

yes but which way do you fix the fan to the case?

So if I just plug the 4 pin adaptor from the cooling fan to the psu molex connector that will be fine will it?

Yewen · 10 Apr 2006 at 20:25

Which way

Air goes in at the front, out at the back on most cases.

Yeh just a molex should be fine.

xirokx · 10 Apr 2006 at 20:30

so by connecting the molex up to the four pin adaptor on my cooling fan it will automatically be running at 7v instead of 12v?

So which way do you attach the fan? With the blades (without the protector) facing the front?

Yewen · 10 Apr 2006 at 20:47

Your not making sense to me now

Sorry.

You have a 80mm 3 pin fan, which you are running through a 7v 3pin to 4pin adapter?

If it does nto make the crossover for you then you have to change the positioning of a wire, as in the volt modding guide.

The case fan blows air in one direction, you turn it around to change the direction it blows.

Raikiri · 11 Apr 2006 at 00:22

xirokx said:
so by connecting the molex up to the four pin adaptor on my cooling fan it will automatically be running at 7v instead of 12v?

So which way do you attach the fan? With the blades (without the protector) facing the front?

Just as an example, that fan is blowing <<<<<<... understand now?

And if you wire the fan for 7v then yes, you just plug it in.