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Originally Posted by Butcher
Assuming you don't stall them, power drawn is propertional to the cube of the speed of the fan. Speed is proportional to voltage.
So at 12V, you draw 0.5^3 as much power as at 24, which is 3.25W.
At 6V the fan will have stalled. In fact given 12V is the minimum voltage, you'll not really be able to adjust them much off a standard PC supply as they'll stall at around 10-11V.
According to specs the maximum you can pull off a MX212 fan header is 750mA, at 12V that's 9W. So you can run 2 fans off one header, though given you won't be able to adjust them, you won't really see much benefit over just hooking them directly to the 12V.
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I have a variable resister and I have had the fan power up with a low a voltage as 6 volts according to my volt meter...
With the MX212 I have run other fans at 10% of it's rotations speed and it actualy powers down for a second then starts back up...
So I think the MX212 tracks rotation and raises voltage enough to start the fans spinning again...
I'll have to test it more in the future.
Thanks for the info
