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4th Generation Intel® Core™ Processors With 10% more processing power, 4th generation Intel® Core™ processors deliver the performance to increase business productivity for your business. They can also guard against identity theft and ensure safe access to your network with built-in security features. 3.5" Solid State Hybrid Drive Gain faster data access and up to 10% better performance with the industry-first 3.5" solid state hybrid drives. Eco-friendly and Energy Efficient Lenovo Desktop Power Manager lets you balance power management and performance to save energy and lower costs. The E73 is also ENERGY STAR compliant, EPEAT® Gold and Cisco EnergyWise™ certified-so you can feel good about the planet and your bottom line   Processor Intel® Core™ i3-4170 3.7GHz 3MB cache, Dual Core Memory 4GB 1600MHz DDR3L SDRAM 2 x DIMM Hard Drive 500GB HDD Optical Drive SuperMulti DVD writer Software Operating system: Microsoft Windows 7 Professional (64-bit) + Upgrade to Microsoft Windows 10 Professional (64-bit) Flyer Display Not included Graphics Intel HD Graphics Input Devices Wired Keyboard and mouse Networking Integrated 10M/100M/1000M Gigabit Ethernet Power Supply 180W STD Dimensions Width 400 mm Depth 160 mm Height 397 mm Weight 7.5 kg Interfaces 2 USB 3.0, 4 USB 2.0, VGA, RJ-45, Display Port, 1 x Microphone In (Front) 1x Microphone In (Back) Headphone Warranty 1 Year Manufacturer Warranty