Designed for the Intel Pentium 4 Socket 478. Does not generate noise or vibration in Silent Mode. Pure Copper base materials ensure excellent heat dissipation. Separation of the FHS from the CPU fan prevents vibration to the CPU. The cooling fan can be mounted at any desired location. Adjustable fan speed controller (FAN MATE 1). Included: QM6500, fan (with bracket), adjustable connector, greese, clips & bolts. Specifications Dimensions(mm): 115-120 (L) x 83(W) x 65(H) Dissipation Area(cm2): 3400 Base Material: Pure Copper Weight(g): *898 Thermal Resistance(Deg.C/W) (Silent Mode): 0.33 (Normal Mode) 0.28 Fan Specifications: Dimensions: 92 x 92 x 25 (mm) Weight: 88(g) Rot. Speed: 1600rpm (+/-) --- 2500RPM (+/-) Noise Level(dB): 20.0 --- 33.0 Bearing Type: sleeve