Peripheral Enhancements' memory products provide maximum power, speed, quality and reliability. They allow users to maximize system performance resulting in quicker document rendering, faster Internet downloads, quicker saves and loads, and rapid game play. Peripheral Enhancements' memory upgrades are the fastest way to upgrade your computer system and are perfect for virtually every computer system.This memory is designed for HP Color LaserJet 4600, 4600dn, 4600hdn, 4600dtn, DesignJet 5000/5000ps, LaserJet 4550/n/dn/hdn.