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

[Speedy Pete]

Anyone know of any cables or mods that can reduce 3pin fans from 12volt to 7 or 5volt.
Overclockers only have a cable which reduces it to 10volt
Need to silence 9 140mm fans

 

[Speedy Pete]

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

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

 

[Speedy Pete]

cheers