Give you system a power boost with the Raidmax RX-450K. It's a great choice for replacing a power supply on an older system. The 20+4 main power connector and 4-pin CPU power connector ensures compatibility with most current mobos. There is also an SATA connector so you can take advantage of the higher capacity and speed of today's drives. Dual 80mm fans provide constant airflow to keep the unit cool even under maximum load. Fans: 2 x 80mm Fans Main Connector: 20+4Pin +12V Rails: Single PCI-Express Connector: No SATA Power Connector: 1 Efficiency: Up to 75% Over Voltage Protection: Yes Overload Protection: Yes