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Did I do the 7V fanmod right?

Discussion in 'Case Central' started by Vegeta, 12 Jul 2006.

  1. Vegeta

    Soldato

    Joined: 6 Nov 2004

    Posts: 5,762

    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?
     
  2. Yewen

    Capodecina

    Joined: 9 Nov 2003

    Posts: 17,719

    Location: Leeds

    Both at 7v. :)

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

    Soldato

    Joined: 6 Nov 2004

    Posts: 5,762

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

    Soldato

    Joined: 6 Nov 2004

    Posts: 5,762

    Is there anyway to mod a fan to run at 7V if it only has 3 pins and not the 4 pin molex connector?
     
  5. Mikey1280

    Wise Guy

    Joined: 1 Jan 2006

    Posts: 1,526

    Location: South East London

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

    Soldato

    Joined: 6 Nov 2004

    Posts: 5,762

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

    Capodecina

    Joined: 5 Jul 2005

    Posts: 17,780

    Location: Brighton


    Yes, plug the end into a fan controller :p

    You need to use a molex as it is the only connection (afaik) that has the -5 and 12 voltages.
     
  8. Mikey1280

    Wise Guy

    Joined: 1 Jan 2006

    Posts: 1,526

    Location: South East London

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

    Mobster

    Joined: 8 Nov 2002

    Posts: 3,345

    Location: Near Bristol, Uk

    Resistor soldered inline...

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

    Cheers,
    Sam C
     
  10. Yewen

    Capodecina

    Joined: 9 Nov 2003

    Posts: 17,719

    Location: Leeds

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

    Mobster

    Joined: 8 Nov 2002

    Posts: 3,345

    Location: Near Bristol, Uk

    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