Includes: a working Mainboard, CPU, Optical DVD drive, Power Supply and Case. Does NOT include: RAM (Memory) or HDD (hard drive). Model: ThinkCenter M58 Type: 7373 Mainboard: Lenovo MTQ45MK Panda L-IQ45 CPU: Intel Core 2 Duo processor in a LGA 775 socket System was upgraded to and ran Windows 10 Pro. Web link to full system specifications: https://support.lenovo.com/au/en/solutions/pd001803 Web link to Lenovo Support: https://pcsupport.lenovo.com/ca/en/products/desktops-and-all-in-ones/thinkcentre-m-series-desktops/thinkcentre-m58