350W ATX Power Supply HP ATX-250-12E ATX-300-12E 80mm Internal Fan Fans: 1 Main Connector: work on both 20 pin and 24 pin motherboard SATA Power Connector: 2 Efficiency: 70% Min. at full load MTBF: 100,000 hrs at ambient conditions Dimensions: 5.9 W x 3.9 H x 5.5 D - Inches