Processor: typically features intel core 2 duo (e.g., e ghz) or core 2 quad processors.
memory: supports ddr3 sdram (1066 mhz or 1333 mhz). while often sold with 2gb or 4gb, the mini-tower has four dimm slots and can be upgraded to a maximum of 16gb.
storage: commonly equipped with sata hard drives ranging from 160gb to 500gb. it can be upgraded with modern solid state drives (ssds) for improved performance.
operating system: originally shipped with windows 7, but many refurbished units now run windows 10 pro.
connectivity: includes multiple usb 2.0 ports (8 external), displayport, vga, esata, and gigabit ethernet.