"PART NUMBER REPRESENTS BASIC COMPUTER WITH INTEL Q75 EXPRESS CHIPSET; CONFIGURE OPTIONS ARE FOR OPERATING SYSTEM, STANDARD OR HIGH EFFICIENCY CHASSIS, HARD DRIVE(S), OPTICAL DRIVE, INTEL PROCESSER, RAM MEMORY, MOUSE AND KEYBOARD. MONITOR SOLD SEPARATELY. REAR I/O INCLUDES (4) USB 3.0 PORTS, (2) USB 2.0 PORTS, SERIAL PORT, PS/2 MOUSE AND KEYBOARD PORTS, RJ-45 NETWORK INTERFACE, DISPLAYPORT 1.1A"