On the test bench today is a boxy tower-style processor heatsink from Cooler Master called the Hyper 612 PWM. This is a pseudo-quiet cooling heatsink built around six, 6mm diameter copper heatpipes and a single 120x120mm PWM fan. The fan rotates at 2000-600RPM and offers at best, excellent thermal performance. At the slowest fan speeds you can expect very quiet but generally average performance from the Hyper 612 PWM heatsink.
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