"The Gammaxx 400 heatsink ships with a 120mm PWM fan that rotates at 1500-900RPM and moves upwards of 66CFM at full speed. According to Frostytech's real world sound measurements, the heatsink produces between 48-39 dBA noise, making it pretty moderate on the sound front. As with most tower heatsinks, a set of extra wire fan clips are supplied so users who wish to install a rear-mounted fan can run both at low speeds."
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