CPU support : Supports LGA1156 Socket i3/i5/i7 series CPU Chipset : Intel HM55 Express Chipset Memory: 2 x 240-pin DDR3 SDRAM slots Memory up to 16GB Supports dual channel DDR3 1066/1333/1600MHz LAN: with 10/100Mbps LAN onboard Audio : with 6-channel HD Audio Codec onboard provides front audio interface provides front stereo mic interface Expansion slots : 1 x PCI Express x 16 slot 1 x PCI Express x 1 slot I/O connectors：1 x PS/2 keyboard port,1 x PS/2 mouse port 4 x USB.compatible with USB 1.1 FOR HM55-336-P 6 x USB,compatible withUSB 1.1 FOR HM55-336-U 1 x VGA port 1 x HDMI port 1 X RJ45 port 1 x 3-in-1 Audio port(line In/Line Out/MIC In) 1 x 24-pin ATX power connector 1 x 4-pin ATX 12V power connector 2 x USB connector,can support4 x USB 2.0 1 x F_ AUDIO connector 1 x F_ PANEL connector 1 x SPEAKER connector 1 x FAN connector 4 x serial SATA connector port 1 x LPC_ DE BUG connector ​Form factor：Micro-ATX architecture (17 x19cm)