"The Zerotherm Nirvana 120 heatsink is compatible with socket 775 Intel Core 2 Duo/Quad/Extreme and socket 754/939/940/AM2/AM2+ AMD Athlon64 processors. It ships with a manual fan speed controller that can bring sound levels down to whisper quiet, though we'd prefer to leave that aside and let the Nirvana 120 work at its best. You'll see exactly what we mean by that a little later in this review. A 120mm fan is set within the body of the heatsink, and it spins at a speed of 700-2600RPM (as manually controlled). A pair of blue LEDs illuminate the translucent impeller blades."