Genuine KDM-KG8500 Nickel Coating (NOT A SUBSTITUTE) 500 Watt ATX Power Supply Replacement for Dell 3100, E310, 5000, 5100,E510, E521/E520,OptiPlex Towers GX320, GX520, GX620. Compatible part numbers: W8185, M8802, M8805, M8806, X8129, C9962, YH542, C5201, D5032, MC164,L305N-00,CX305N-00,NH493,PS-6311-2DF2, H305P-00, HP-P3067F3P, NPS-305DB B, N305N-00, HP-P3067F3, NPS-305EB B, N305P-03, N305P-04 Designed with Smart Auto Fan Speed Controller Compatible with Dell, HP, IBM, Compaq and Gateway PS2/PS3 Power Supply Unit High level of energy efficiency, quality and security, environmental friendly, compact in size