Thermaltake TR2 W0101 550-Watt Power Supply for ATX 12V 2.0 Complies with ATX 12-volt 2.0 version Support 2 PCI-Express, 4 SATA, and 20+4 pin connector Low noise 12cm fan and mirror effect casing PFC function, improved energy efficiency and reduced current load on AC delivery systems Protections against Over Current, Over Voltage, and Short-Circuit