With the top of the line model within the series, your office can have maximum productivity and control of your demanding printing needs.  The C7550hdn delivers business color printing without compromise besting the C7350hdn model by increasing printing quality to 1200 x 1200 dpi resolution.  Just like the rest of the models in the series, you will get full-color output at up to 24 pages per minute and monochrome at up to 26 ppm.  You will also come to appreciate the standard duplexer unit that will allow you to print two sided documents very easily. All C7550 Series printers can be connected to your network via an internal 10/100 Base-T OkiLAN print server, and a powerful 500 MHz processor means less time waiting for documents to print from your PC or Mac. To maximize the performance of your printer now or as your needs for large documents and complex graphics grow, every C7550 model ships with a standard 320MB of RAM that can be upgraded to 1 GB RAM. And, to augment their document/ file storage capabilities, the C7550hdn includes an internal 20 GB hard disk drive.  The C7550hdn is a printer that performs above and beyond what you would expect from a full featured laser color printer in this price segment.