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Old 18th June, 2002, 04:25 PM
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Safe HSF Fan Speed

Does anyone have any suggestions as to the lowest safe voltage to run a cpu fan at when not under much load?
My fan runs at about 7000rpm and is quite loud. I'd like to lower the the voltage to the fan and therefore lower the rpm when the cpu isn't under much load to keep the noise down.
For those of you who have done this before, what did you drop your fan voltage down to?

Thanks,
Claudius
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Old 18th June, 2002, 04:29 PM
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7 volts is easy to accomplish and is safe, it will "self start" the fan and it can be switched to the full 12 on the flick of a switch. Basically you switch it between 12v and ground, and 12 v and 5v. Its not amazingly good for the PSU but it works. Much less than 7 V and the fan is incapable of starting itself up and will end up costing you a lot of money if it is on your heatsink!
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Old 19th June, 2002, 12:15 PM
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A "normal" 80mm cooler fan runs at about 3200rpm-ish

At 7000rpm, is it a Delta you have, perchance?

Lowering the voltage will certainly lower the noise, but remember to consider the performance effects......
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Old 19th June, 2002, 06:31 PM
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While popular, the Amperage available is very small with the 7v trick. I suggest a rheostat or suchlike as a better solution.

Some fans can't start spinning from "off" when 7v is given to them. Kinda don't want this to be a CPU fan.
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