The Lexmark T644dtn delivers a simple solution to office printing while exceeding in performance and versatility. The T644dtn laser printer comes with an impressive 514 MHz processor as well as a lofty 128 MB of RAM, enabling lightning fast print speeds up to 50 pages per minute or up to 37 sheets per minute when using the auto duplex unit. 2400 quality dpi provides your business with the image clarity and precision it deserves. If upgrades are what you need, the T644dtns optional additional paper trays, memory, finishers and wireless print servers allow your printer to grow along with your business. The Lexmarks T644dtn professional results combined with its simplicity will amaze you and your business.