Check the listing for details. Cooler Master AMD Socket 1207 1U Low Profile Active Copper Heatsink Blower Fan. Condition: New. Listed at 33.50 USD. Cooler Master E1K-7CCSS-04-GP Athlon / Opteron 1U SystemApplication System: Embedded Active SolutionCPU Type: AMD Athlon64, AMD Athlon X2 (Dual Core), AMD Opteron (Dual Core)Supported CPU Frequency: Athlon64 up to 2.6 FSB 2000/1800 MHz, Athlon64 X2 up to 2.4 FSB 2000 MHz, Opteron up to 2.4Socket Type: 754 / 939 / 940 pinsHeat Sink: Copper Base + Copper Skived FinCooler Dimension: 98 x 74 x 26 mmFastener: Screw + SpringInterface Material: Shin Etsu x23-7783Fan Dimension: 70 x 70 x 15 mmFan Speed: 5,400 rpmFan Airflow: 8.9 CFMFan Bearing Type: Dual Ball BearingVoltage Rating: 12 VNoise Level: 40 dBAConnector: 4 pins with PWM functionThermal Resistance: For Athlon64: 0.23 °C/W at 27 CFM, For Athlon64: 0.23 °C/W at 27 CFM, for Opteron: 0.27°C/W at 27 CFM, For Santa Rosa: 0.24 °C/W at 27 CFM