The Celeron® processors support a wide range of multimedia capabilities to entertain and entice all throughout your day. Create, edit, and manage important files on the go. Easily organize contact lists and messages. Experience improved features and functionality to help you be more productive at work. The Celeron® processor levels up the fun with improved graphics, smooth action, and healthy battery life to support enhanced casual gameplay. Intel Celeron Lenovo ThinkCentre A51, 2.8 GHz, Intel® Celeron®, 0.25 GB, 40 GB, CD-ROM, Windows XP Home Edition Lenovo ThinkCentre A51. Processor frequency: 2.8 GHz, Processor family: Intel® Celeron®. Internal memory: 0.25 GB, Internal memory type: DDR2-SDRAM. Total storage capacity: 40 GB, Optical drive type: CD-ROM. Discrete graphics card model: Intel® GMA 900. Operating system installed: Windows XP Home Edition. Power supply: 310 W. Chassis type: Tower. Product type: PC. Weight: 27.6 lbs (12.5 kg) https://www.pcmag.com/review/169443/lenovo-thinkcentre-a51-ultra-small-8105-26u The Lenovo ThinkCentre A51 Ultra Small ($1,299 direct, $899 without monitor) is a secure small form factor business desktop suited for both the small office and for enterprises. Unlike older small-sized systems, such as the Apple Mac mini), which hav... Compact. Shares Ultrabay components (optical and removable hard drives) with ThinkPad line. Hardware security, including biometrics. Easy-to-service components. Internal power supply. Not very expandable. Non-removable palm rest in keyboard. With a compact form factor, decent pricing, and proven quality, the Lenovo ThinkCentre A51 Ultra Small should easily find a home in offices around the country.... Well-designed office PC takes up little space and permits easy--though limited--upgrades to extend its useful life. Small footprint; well designed Modest performer; limited expandability Adequate expandability will keep this small-footprint PC on office desktops well into the future.