Product Name: ATX 500W 12cm silent Power Supply Model NO.: ATX-500W Hard Disk Interface: 2~4 Feature: Wide Fan Size: 12" Fan Type: 12cm ATX Standard: ATX 12V 2.2 Power: 300-500W Certification: CE, RoHS, CCC, FCC Use: Desktop Product Description ATX 12V 2.22&2.3 comply.1 The 12cm or 14cm big fan that can cool the case and have Mute function2 The 20+4 pin, and 4*big 4pin, one small 4pin, 2 *SATA.3 The Active PFC(Optional)4 New circuit designation of power saving, stand -by power less than 1 W (watt).5,LongerCable6, TC Control, EPS7, PCI-E fast express8,Single rails 12V ouput