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Beware the Attack Basset
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bigviking said:
If it has three wires going to it, it's fixed speed. If it has four, it's variable based on temperature. Open it up and take a look.
I can't say I've ever seen a four-wire computer fan. In most modern computers, the motherboard controls the speed of the fans, not the fans themselves. By the time the fan figures out it is getting hot, it is probably too late.

It would appear that since the temperature stabilizes at 129F regardless of ambient, it must be speed controlled (or that's where the thermometer tops out).
 
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