Server Fan Voltages

dragon2309

dragon2309

P.I Dragon
Hi, havent been here for a while. Hope you can help.

I have "aquired" an old 24-port switch, it works fine, tis just the fan has shattered its bearings and sounds like a tractor. Ive had it all open and fished about a bit, turns out the fan is 40 x 40mm and is 20mm in depth, it connects to the motherboard using a 2-pin motherboard jumper.

So i was thinking "Yay, ive got tonnes of old 40mm fans lying around, jsut shove one in there....." no, it turns out that the fan in there already is 5v, all my fans are 12v (cos there from desktops, not servers), so basically, im asking what will happen if i connect a 12v fan to a (presumably) 5v output.... I say presumably cos i dont actually know what comes out of the mobo header, the fan was 5v, but that doesnt mean the output was 5v aswell....

So yeh, can anyone tell me what would happen if i conencted a 12v fan to it.....

dragon
 
Just my opinion, but I think it will either not work, or will work but run significantly slower.
 
Why don't you just hook it up to the 12V on the PSU?
Thats usually what one would do, although you will not be able to use the BIOS
to control the fan speed and so on. It'll run at its full speed.

red+black is 12V. yellow+black is 5V.
 
yup, thinking about that now it does make sense..... but yeh, to the guy who said plug it into the 12v on the PSU, and also mentioned the BIOS, im working on an unmanaged swithc, not a desktop PC, there is no BIOS and there is no 12v rail on the PSU, in fact there is no PSU (at least not the conventional type your thinking of)

cheers, dragon
 
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