ThinkStation E31, 4x5 Small Form Factor, Intel Core i5-3470 Processor, 3.2 GHz/ 1600 MHz, 6 Cache, 4 GB Memory, 500GB 3.5" SATA HDD, Rambo 8, Windows7 Pro64 Downgrade with Windows 8 Pro64 License, Integrated Audio, Integrated Gigabit Ethernet Adapter, Preferred Pro Full-Size Keyboard, Optical Wheel Mouse, Memory Card Reader, Integrated Mono Speaker, Chassis intrusion switch