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Raspberry Pi S2Pi Manual page 6

Ice tower cooling fan

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7. While the Ice Tower's fan is massively loud, it can get a little irritating. There's a
quick solution: moving the red power cable from a 5V pin on the Raspberry Pi's GPIO
header to the 3V3 pin instead. This can reduce both the fan speed, noise, and the
brightness of the LED light, at the cost of it pushing less air through the heatsink stack.
Size and Packaging

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