XION 3 Dual Heatpipe with HDT Technology, 90mm PWM Fan, CPU Cooler XON-HP9310P - Retail Raised Fin-stack of U-type Design for Perfect airflow direction and excellent compatibility. H.D.T. ( Heatpipe Direct Touch ) Technology. Premium PWM 90mm Fan, Available for Two Fans installed. 3 in One mounting Black-plate ( 775/1156/1366) and High-end Thermal Compound .