Product OverviewsDynatron K2 1U Server & Workstation Active CPU Cooler - Intel Socket 1155/1156. The Dynatron K2 1U Server Active CPU Cooler is designed for Intel® socket 1155 / 1156 up to 73W. The PWM Fan connector, low profile and the standard push pin mounting mechanism makes this a great choice for MINI-ITX cooling. Pre-applied thermal grease make this cooler easy to install as well.Product Specification Type Fan & Heatsinks Fan Size 75mm Compatibility LGA 1151 / 1150 / 1155 / 1156 Bearing Type 2 Ball RPM At Duty Cycle 20%: 1000 RPM At Duty Cycle 50%: 2500 RPM At Duty Cycle 100%: 4000 RPM Air Flow At Duty Cycle 20%: 6.0 CFM At Duty Cycle 50%: 8.3 CFM At Duty Cycle 100%: 11.9 CFM Noise Level At Duty Cycle 20%: 21.0 dBA At Duty Cycle 50%: 37.8 dBA At Duty Cycle 100%: 44.0 dBA Power Connector 4 Pin Click for Manufacturer Link