Offering room to expand is one of a desktop’s greatest strengths, and the Lenovo ThinkCentre M900 gives you excellent performance with space for growth. This PC is built to military specifications and can withstand punishing treatment, including humid environments, extreme temperatures and sustained vibration. Built-in dust filters will significantly reduce dust intake and are easy to clean, making this computer a low-effort, easy-to-maintain workhorse. Desktop Features Processor: 3.2GHz Intel® Core™ i5-6500 Quad-Core Processor Memory: 8GB of DDR4 SDRAM Storage: 500GB Hard Disk Drive Operating System: Windows 7