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Running an 8000 rpm fan off a mobo fan header... thought?

I wouldn't do it. Too many stories of fan headers blowing out with these fans, even if the header was rated for it. I'd cannibalized a 4 pin molex from an old CPU or case fan and just splice the red/black wires from the Delta onto it. The third wire can remain connected to the 3 pin connect and plugged into the motherboard so RPM's can still monitored. The fan itself would be pulling power directly from the PSU instead of having to go through the motherboard. Works great for me and insures I don't burn anything out.

Of course, they do sell adapters that do exactly what I've described, it's just cheaper to do it yourself.
 
The two people that I know of that had this happen to them, said it burnt over a period of time. One was Epox board, forgot what the other one was.
 
you got a link to splicing directions....?
thanks....

What am i in for as regards the noise?

thanks brian
 
Well, the noise level would be the same. This mod doesn't effect how efficiently the fan works. It only changes where it's drawing the power from. As far as instructions, it's pretty much as I've described. Very straight forward splicing of the red/black wires on the fan onto the red/black wires of a 4 pin molex.

If it would help, here is a picture of a custom RPM wire that you can purchase. Looking at the picture, it's evident that making one yourself is a breeze.

http://store.yahoo.com/sidewindercomputers/customrpmcable.html
 
on the three pin:
Red: 12V
Black: Ground
Yellow: RPM

On the 4 pin:
Red: 5V
Black: Ground
Black: duh
Yellow: 12V

Nothing more to it
 
The SPEED of a fan running off of a mobo header is not an issue; but rather HOW MUCH POWER (as in WATTS) the fan consumes! Power in WATTS = voltage (usually 12 vdc) X Amps
 
the header on my mobo is fried (MSI K7T TURBO LE) so i just hooked the fan up with a 4 pin connector...it's your best bet
 
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