NC51-AH61-4G BC51AA02 INTEL® H61 Chipset Support LGA1155 Sandy Bridge & IVY Bridge Intel Core processor family ON Board SAMSUNG 4G/1600MHz DRAM Support 1*DDR3 1600/1333/1066 DDR3 DIMM slot Integrated HD Audio CODEC with 6-CH Support 2*PCI-Express x16 slots Support 5*PCI slots Support 2*Intel® Gigabit LAN Support 10*COM ports(COM2&COM10 for RS422/485) Support 4*SATA2.0 Support 8*USB2.0 Onboard 1*MiniPCI-E connector(Full size) Support SIM Card Socket (Option) 4 Phase CPU Power Support Support Thunder Protection Function ATX Form Factor(220mm X305mm)