The Samsung ML-4551N is the fatest monochrome laser printer made available by Samsung. It can put out a staggering 45 pages per minute (letter size) making it a must have printer for a business with high printing demands. It gains its power from a 500MHz CPU with 128MB up to 512MB or DDR memory, and also comes with a built in network card making it a fully network-ready printer. It it can also be connected to a computer via USB 2.0 or parallel port and upports a wide range of operating systems including Windows, Linux and Mac OS. The SyncThru web admin service configures and monitors all Samsung and other compatible network printers for group management tasks such as firmware updates, group error reporting and other IT duties. The (similarly named) SyncThru web service is a LAN-connected feature allowing printer configuration using a web browser for quick and easy IT management. The Samsung ML-4551N is also available as the Samsung ML-4551NDR which has an added duplex function allowing you to print double sided documents. Other options include 3 x 500-sheet cassette tray and 40 GB hard drive.