The Shuttle XPC Accessory PC45G is an internal AC to DC power supply unit (PSU) meant as a replacement device for certain Shuttle products. It provides a maximum output wattage of 250 Watt. Its 80 PLUS< Bronze and Energy Star V5.0 compliance helps save on energy costs as compared to previous power supply models such as PC40. In addition, its double ball-bearing fan has a longer lifetime and faces to the inside which reduces the noise level to a minimum.