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Daisy Chaining Fans

J

jotajota

Weaksauce
Joined
Nov 28, 2004
Messages
79
Just wondering how many fans you can run off of one molex connector before they start slowing down for lack of power. I have an Antec Neo 480 watt PSU and currently have four fans coming off the same cord from the PSU, and would like to add one or two more fans. Will these additional fans on the same cord slow down the rest of the fans or will there be enough energy to run them all at maximum/optimal speed?
 
The connectors are run in parrallel so it shouldn't really matter. The only issue you'll have is then you start actually hitting the power limits of the power supply.
 
there shouldnt be much to worry about
consider that each 4500 rpm 80mm fan draws about 0.37A to spinup
and that the wires can deal with probably 16A of sustained draw
(which its not as it drops to a quarter of that once the fans overcome inertia)
it would take a hell of alot more fans than your running to worry about running them in series
and even then the sustained RPM of the fans wouldnt really be the area of concern
but rather the heat in the wires from too much current (resistence)
or the transient load's effect on other components (we are talking a wall of fans here at that point)
 
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