PNY OPTIMA 256MB SDR 100/133 MHz PC100/PC133 Notebook/Laptop SODIMM Memory Module MN0256SSD-100/133 Memory capacity upgrade provides improved system performance and responsiveness Deliver all the productivity your PC has to offer with PNY Memory Compatible with PC100 (100 MHz), PC133 (133 MHz) systems Extend the usefulness of older PCs Easy installation, Free 24-hour Technical Support, and Lifetime Warranty!