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I installed SpeedFan, but the only fan showing up is the one inside my laptop for the CPU.

Since today, I have an additional fan which is external below the Fellowes® - Precision Cooler Laptop Riser.

How can I regulate the fan speed of this external fan which is plugged into my laptop via USB?

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You can't. USB only powers it. There's no data interchange. You can't lower the voltage on the usb.

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