Dell 0F8101 Optiplex GX620 SFF Motherboard - 4 x DDR2 SDRAM Ram Slots - SATA Input - Mini IDE input - 4-Pin PSU input - 24-Pin PSU Input - PCI-E Input - AGP Input - 25-Pin Serial Input - 9-Pin Serial Input - VGA Input - 6 x USB Input - RJ-45 Ethernet Network Input - 3-Port Audio Jack (In/Output & microphone)