CPU - Intel Core i7 / i5 / i3 Mobile Processor Family Chipset - Mobile Intel HM55 Express chipset *Due to Windows XP and PCH chipset (HM55) limitations, if you use Windows XP, please disable the BIOS option "USB2.0 Rate Matching Hub" to make USB devices work properly. Memory - 2 x DDR3 SO-DIMM slots, 4GB per DIMM (Max 8GB*) - Support dual channel DDR3 1066MHz *Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows 32-bit OS. For Windows 64-bit OS with 64-bit CPU, there is no such limitation. VGA - Intel HD Graphics HDD - 2.5"HDD, support 2nd 2.5"HDD ODD - DVD Super Multi I/O - 1 x HDMI, 1 x D-Sub VGA, 6 x USB 2.0, 1 x S/PDIF, 1 x eSATAII* *For eSATA function, Hot Plug function is supported in AHCI mode only. IDE mode does not support Hot Plug function. LAN - Gigabit LAN Sound - 7.1 CH HD Audio with THX TruStudio Pro WiFi - 802.11b/g/n wireless LAN* *300Mbps, 2T/2R Remote Controller - Support MCE function Power Unit - 90W/19V Adapter Dimension - 195mm(W) x 70mm(H) x 186mm(L) Volume (liters) - 2.5L