Dan's Data has posted a comparison review between the Thermaltake A1214 Smart Case Fan and the Cooler Master DAF-B82 Case Fan

Cooler Master and Thermaltake both make thermally controlled 80mm fans, and I've checked them both out.

Never mind what it says on the spec sheet; I've taken them for a spin to see how much power they draw with the sensor cold and with the sensor hot, and just how cold and hot the sensor has to be for minimum and maximum grunt. I've also explored more prosaic concerns, like whether the power and sensor wires are of a practical length.

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