2GB DDR2-533 (PC2-4200) RAM Memory Upgrade for the IBM ThinkPad T40 Series T43 (266897U) (Genuine A-Tech Brand) 2GB DDR2-533 (PC2-4200) RAM Memory Upgrade for the IBM ThinkPad T40 Series T43 (266897U) 100% Genuine A-Tech Brand Memory 2GB DDR2-533 PC2-4200 Non-ECC Unbuffered 200 Pin 1.8V CL=4 Memory Limited Lifetime Warranty High Quality Ram specifically designed for the IBM ThinkPad T40 Series T43 (266897U)