"Hot-plugging" fans to a power supply connector
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"Hot-plugging" fans to a power supply connector
It doesn't feel like a particularly good idea, but I can't think of a reason why plugging in (or unplugging) a fan would be any worse (or better) for the power supply than a hot-swappable drive.
Thoughts?
George
Thoughts?
George
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I think the problem with doing it on motherboard headers is that power to them is supplied via fairly thin tracks, so the sudden surge of current to start a fan may cause a significant drop in voltage. If any other circuitry is supplied from that same track, then it may be affected.
I have frequently done it and not had any problems, but motherboards aren't designed to have things plugged in while they are on.
I have frequently done it and not had any problems, but motherboards aren't designed to have things plugged in while they are on.
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I killed 1 (out of 8 or so) expensive odd sized fan on a 1u IBM server by doing this. No big deal you might think but this caused the motherboard to register the fan failure and switch all the other fans into overdrive. Ever heard a plane take off indoors? The joys of 20(?)mm fans at high rpm!
I looked it up and there was tons of people who had done the exact same thing with this same server. Perhaps depending on the design it will be fine, in other times as i (and others) have mentioned, it can go wrong.
I looked it up and there was tons of people who had done the exact same thing with this same server. Perhaps depending on the design it will be fine, in other times as i (and others) have mentioned, it can go wrong.
I do the mobo fan header thing all the time, but reading a few of these replies I might be a little more careful in future, especially when working with somebody else's machine.
I've also accidentally shorted a mobo header - not with a fan, but when I was mucking around with a multimeter trying to figure out how the voltage control behaved - and the result was the same as others have posted - instant power-off. I was lucky in that it rebooted fine, but I've read others' reports where they say their whole mobo got fried. I'm guessing the end result might depend mostly on your PSU and the quality of its fault protection.
I've also accidentally shorted a mobo header - not with a fan, but when I was mucking around with a multimeter trying to figure out how the voltage control behaved - and the result was the same as others have posted - instant power-off. I was lucky in that it rebooted fine, but I've read others' reports where they say their whole mobo got fried. I'm guessing the end result might depend mostly on your PSU and the quality of its fault protection.