KIT 4GB (2X2GB) PC25300 ECC REG 240 PIN DDR2 EDGE Tech memory products provide maximum power, speed, quality and reliability. Products are double-tested to provide a high-quality and reliable memory upgrade. EDGE Tech memory allows users to maximize system performance resulting in quicker document rendering, quicker saves and loads, and rapid game play. EDGE Tech memory upgrades are the fastest way to upgrade your computer system. This memory is designed for the following systems: IBM System X X3455 (7984, 7986-xxx); IBM System X X3655 (7985-xxx); IBM System X X3755 (8877-xxx).