On Mon, 19 Feb 2001, Thomas Charron wrote:
> If other posts hold true, that the fan motor if powering according to CPU
> usage ...
Slight correction: By temperature, either of the CPU itself, or some other
temperature probe point. An idle CPU in a properly configured system runs
cooler. A hard working CPU generates more heat. Other conditions (ambient
air being the most prominent) can also change the temperature at the probe
point, and thus the fan speed.
> Its very possible, but most fans I've seen are powered directly off of the
> power supply, and not on the same power as the processor itself..
In older systems, yes. Newer systems generally connect at least the CPU fan
directly to the motherboard. Chassis fan connections are almost as common, and
you even see a few power supplies whose fan has an external lead for
connection to the motherboard (generally name-brand systems with semi-custom
parts). These all connect using a three-pin connector: Power, Ground, and
Monitor. Combined with temperature sensors, the system can adjust fan speed
to match the need for cooling, and alert you if a fan fails. It can even do
things like turn the fans completely off during power-saving modes (which
produce far less heat).
--
Ben Scott <[EMAIL PROTECTED]>
Net Technologies, Inc. <http://www.ntisys.com>
Voice: (800)905-3049 x18 Fax: (978)499-7839
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