Need for special fan adapter, help please

[signmeuptoo]

A member in another forum has this problem, and I wanted to see if there
was a way to assist him:

What I thought would be a simple install now needs connectors I can't find.
The cpu fan I want to control has a 4-pin molex for power and a separate
yellow cable for rpm sense. The zalman connects to the mobo and has a 3-pin
female plug that is designed to take a fan that uses 3-pin. I can't find
the right connector on newegg or svc. What the hell? I could get a 4-pin to
3-pin but then I loose the rpm sense. I've got a box full of connectors and
sure enough, not one that I need.

~If any of you know what is available, or of some good cable products
dealers, please let me know, I don't know where to even start!

 

[cr500r]

The connector may or may not exist, I don't know.
I would get my wire cutters and that box of connectors, and wire my own
adaptor with some crimp connectors (or wire nuts)

The connector on the motherboard is wired like this:
1 Ground
2 +12V
3 RPM Sensor

(if you don't know which is pin 1 you can test 1&2 with a volt meter to find
12 Volts with the mother board powered up)

The 4 pin molex is wired like this:
Red: 5V
Black: GND
Black: GND
Yellow: 12V

Note: if you want to run a fan at 7V you can wire it to use 5V as GND and
12V as =7V
it's simple math 12 - 5 = 7
more on this: http://www.techtastic.ca/articles/12to7.html

Jeff