Computers & Electronics

Will running a 12v computer fan off a 5v USB port damange the USB?

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  • Oct 27th, 2007 7:16 pm
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Dec 9, 2003
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Will running a 12v computer fan off a 5v USB port damange the USB?

I am planning on buying a computer fan and modding a USB cable to hook up to it to use as a fan to vent hot air out of the back of my TV stand that my Xbox runs in. As there is a USB port on the back of the Xbox, I plan on taking power from there to power the fan.

However, I am just wanting to make sure that this won't damage the Xbox's USB port, if the fan is rated for 12v but I'm only giving it 5v.

Thanks
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Deal Guru
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Nov 27, 2005
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5v is enough to power regular computer fans. However, I doesn't suggest using the USB ports because there might not be enough current depending on the fan. I tried making a USB fan before and it was a big hassle. It's much easier to hook it up to the power supply by extending a power cable outside the case.
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Jul 22, 2007
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board123 wrote:
Oct 27th, 2007 3:55 pm
5v is enough to power regular computer fans. However, I doesn't suggest using the USB ports because there might not be enough current depending on the fan.
Eaxctly, voltage won't be your problem. I'm not sure how much current USB can give but it's probably not much.
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I thought USB was either 0.25 or 0.50 amps.
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I know this is for an XBox, but if you had a similar idea for a PC, this is a GREAT solution for $4:

Image

A PCI slot plate with dual Molex outputs and 3-pin headers.
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[OP]
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Yeah I was more worried about the current the fan requires from the source than the amount of voltage required to run it.
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Apr 30, 2007
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And even if it does run, the fan will be severely starved and it'll barely push any air. You'd be better off running a fan rated for 5v or finding a 12v source.
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Goonish wrote:
Oct 27th, 2007 5:50 pm
And even if it does run, the fan will be severely starved and it'll barely push any air. You'd be better off running a fan rated for 5v or finding a 12v source.
That really depends on the device. This thing I made pushes a huge amount of air at 5v. It probably blows more air than most regular case fans at 12v. But then again, it's using the 5v line from my power supply, not a USB port. It probably wouldn't even spin up if I tried to power it with USB.

Image
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Hey board123 - what exactly is that? Your custom fan? But what are those ATI "cases" or whatever?
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Kaitlyn wrote:
Oct 27th, 2007 7:02 pm
Hey board123 - what exactly is that? Your custom fan? But what are those ATI "cases" or whatever?
It's a blower and works like a fan. I just put it beside the monitor and it cools me down :cheesygri It's made out of 3 coolers from X1900XT.

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