Information technology professionals rely on HP quality to ensure maximum productivity. As the power of applications, processors, memory adapters and storage devices increases, high-end computer users are seeking ways to optimize their system performance. HP provides leading solutions, adding new levels of performance, availability, flexibility, and management.??This modem is designed for the following Compaq systems: ??Deskpro EP desktop PC; ?Deskpro SB minitower 6400/6400CDM; ?Deskpro 4000N; ?Deskpro 4000S; ?Deskpro EN - Large Form Factor; ?ProSignia Desktop 310; ?ProSignia Desktop 330; ?Professional Workstation 5100.??For a complete compatibility list please refer to the original manufacturer's web site.