Product Description: Input Socket Only, 20 + 4 Pin (35cm) , P4 Pin (40cm), MOLEX + SATA (35cm + 15cm),MOLEX + SATA (35cm + 15cm) 12cm cooling fan with speed control enables ultra silent operation,Super Silent Power Supply Support for Multi-Core CPU Indicates compatibility with systems that have multi-core processors. PWM (Pulse Width Modulation) is a technique used to control the speed of the fan. It helps in adjusting the fan speed according to the system's temperature, allowing for quieter operation when the system is not under heavy load. Years Warranty – The PSU comes with a full 2 years manufacturer warranty Warranty :2 YearFeatures: 550W Power Supply 2XSATA Complete Built-in protection Silent Fan PWM Support multi Core CPU