3-pin fan ( 12v ) to ( 7/5v )

Connect 12/10V cables in series. 10/12 = 83%, 2 cables > 69% or 12 x 0.69 = 8.3V, 3 cables 57% = 6.9V.

Not the cheapest solution :)

Alternatively power the fans from the 5V lines on the molex plug.
 
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Oh nvm, I get you now. it was the cable part I didn;t quite get! I know what you mean now. Not a great solution!

I would wire the 3 pin fan header to either the 12v/5v to give 7v and wire it through the PCB to supply power to the fans.
 
Get 12V, 7V or 5V for your Fans

http://www.silentpcreview.com/article6-page1.html


or just google "fan cable 7v" or "fan cable 5v" many places sell them but for 9 fans why dont you buy a fan controller ? If you want not to have a fan controller (I don't really like the extra mess thay can make inside your case), buy the fan cables or make them and hide them behind the back side panel with the other cables.
 
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That Fan Multi Power Port - 12V / 7V / 5V - 12 Connections looks the business, but i got impatient ( because of 9 annoyingly loud fans ) and went ahead with buying
9x Aerator voltage adaptor cable bulk, 3 pin plug > 3 pin jack CAK S-20 FAN ADAP CABLE 12V > 7V .
at £2.09 a piece :o

The way i got the fans connectcted means that the yellow cable doesnt actually get a connection. Does this cable i bought rely on that connection? :S
 
The yellow cable is the RPM sensor so it won't affect the running of the fan by not having it connected.

You just won't be able to detect the speed of the fans.
 
This works particularly well with a toggle switch. Wire the 12V direct to the fan, and then switch the other fan wire between the 5V, earth, and disconnected. This gives full speed, slow, and off depending on where the switch is. Soldering iron pretty much required though.
 
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