DESC: EDGE memory products provide maximum power, speed, quality and reliability. The distinctive blue EDGE is Peripheral's assurance that users have purchased a high-quality and reliable memory upgrade. EDGE memory allows users to maximize system performance resulting in quicker document rendering, faster Internet downloads, quicker saves and loads, and rapid game play. EDGE memory upgrades are the fastest way to upgrade your computer system and are perfect for virtually every computer system. This memory is designed for the following systems: HP LaserJet 2420, HP LaserJet 2420d. For a complete compatibility list please refer to the original manufacturer's web site.