mashersmasher

well i have a bunch of fans all of which are about the same size and dimentions. one is specifically a cpu fan and the other 2 are regular but small case fans. the case fans shut down as soon as they lose power and start much faster then the cpu fan but the cpu fan also tales a much longer time to stop. i suspect this is because it's designed to dissipate heat for a second or 2 after the computer shuts off to maintain the cpu. it's off of a socket a heatsink and we all know the heat problems socket a cpus are prone to. i suspect that the there is a capacitor inside that keeps the fan going at a steady speed and also takes a moment to discharge when the pc is turned off. if so then the fan might be able to take a bit more voltage then it's designed to and still remain reliable which could give a bit of extra cooling on air cooled cpus. dunno just a bit of brainstorming.

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killa_concept

If you're talking about the stock socket A fans like the one above, no I don't believe those things have a cap in them... They're designed to spin @ 5000ish (maybe more?) RPM or so... makes sense that they'd take a few more seconds to stop than your regular fan...

And on a personal note, I've developed a fear of soc A stock cooler fans... Messing around with the innards of my old socket A rig (while powered on), my knuckle went a bit too close to it... literally ripped a decent bit of skin off... that x1600 didn't originally have a red PCB

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HauntSheep

NoL

I think simply speed and bearing type here. Very few fans have capacitors as fan's won't run at all voltages. So as capacitor charge would drop off a little bit left would turn into feedback.

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nategr8ns

I believe it is sunbeam that makes a small "Fan power pyramid" to keep fans powered on for a little while after the computer is turned off. It just charges up while the computer is on, and gives the power away to the fans once it stops charging.

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arjo_reich

now is that with the fan plugged into a specific lead off the motherboard or no? Does it behave the same when it's plugged into the power supply directly?