"In this review Frostytech is evaluating the ASUS Silent Knight II heatsink. The Silent Knight II is a copper heatsink vaguely reminiscent of the Zalman CNPS9700NT. Like most thermal solutions being introduced, it's compatible with Intel Core 2 Duo/Quad/Extreme and AMD Athlon64 processors. A 92mm PWM fan is set within the body of the heatsink and spins at 800-2300RPM, generating no more than 46 dBA in Frostytech's real world measurements. A pair of blue LEDs illuminate the translucent impeller blades, giving the Silent Knight II a nice visual effect."