The Dell Optiplex GX620 computer is a reliable desktop featuring a Pentium 4 processor with a speed of 3.40 GHz, 4GB of RAM, and an 80GB hard drive capacity. It runs on Windows XP operating system, providing a solid foundation for basic computing tasks. With its reputable brand and model, the Dell Optiplex GX620 offers a consistent and efficient performance for users looking to refresh their desktop system.