Dell Optiplex 0X1105 GX270 SFF P4 Motherboard - Small Form Factor - Dual RAM Slots (Supports Upto 4Gb) - 1 x AGP Slot - 1 x PCI Slot - mPGA478B P4 Processor Socket - 20-Pin Power Input - 3-Port Audio Jack (In/Output & Microphone) - 6 x USB Inputs - 1 x RJ-45 Ethernet Network Input - Dual PS/2 Input (Mouse & Keyboard) - 25-Pin Parallel Input - VGA Input - 9-Pin Serial Input