This passive (fanless) cooler by Nexus cools the latest Pentium M coolers without any noise. PSM-2500 Specifications Model number: PSM-2500 Socket 479 (Pentium® M, Celeron® M, Core Duo, Core 2 Duo) 1U Size: 50 x 50 x 25 mm Passive SkiveTek® heat sink Full copper, 99.5% pure, C1000 copper material Thermal resistance: 1.077°C/W Weight: 265 gram Including screw & spring fasteners, backplate and thermal grease Complies to WEEE & RoHS environment directives