Help improve the overall performance of your ThinkCentre systems with the 1GB PC2-6400 Non-Parity (NP) DDR2 SDRAM Unbuffered DIMM (UDIMM) memory upgrade. PC2-6400 DDR2 SDRAM enables up to six times the performance of traditional SDRAM(2). Adding additional ThinkCentre memory is a cost-effective way to help boost your system performance and enhance your ability to run more programs simultaneously. Compatible with ThinkCentre A57, A58, A58e, A61, A62, M57, M57p, M57e, M58e, Ultra Small Form Factors (USFF's), Small Form Factors (SFF's), Desktops, Towers systems. NOTE: PC2-5300 and PC2-6400 memory can coexist on one system, but will operate at PC2-5300 speed. The new ThinkCentre PC2-6400 NP DDR2 SDRAM UDIMM memory offerings let you upgrade standard system memory capacity to improve overall system performance.