Model: K199; Type: Fan & Heatsinks; Fan Size: 80mm; Compatibility: Inter: Socket 1156; Bearing Type: 2 Ball; * RPM: At Duty Cycle 0~20%: 1000 RPM; At Duty Cycle 50%: 2500 RPM; At Duty Cycle 100%: 5000 RPM; Air Flow: At Duty Cycle 0~20%: 5.355 CFM; At Duty Cycle 50%: 7.654CFM; At Duty Cycle 100%: 14.719 CFM; Noise Level: At Duty Cycle 0~20%: 20.71 dBA; At Duty Cycle 50%: 37.5 dBA; At Duty Cycle 100%: 51.7 dBA; * Power Connector: 4 Pin (PWM); Heatsink Material: Copper; Fan Dimensions: 80 x 80 x 15 mm; Heatsink Dimensions: 85.0 x 81.5 x 28.5mm; Weight: 355g ? 5g; * Features: CPU Support: Intel Core i5 I5-750; Xeon Processor 3400 Series; Core i7 Processors, I7-870 & I7-860;