IBM ThinkPad R40 2681-xxx compatible 1GB 266MHz DDR SO-DIMM Black Diamond memory. Compatible computer model: IBM ThinkPad R40 2722-xxx/2723-xxx/2724-xxx, X31 2884, T40 2378, R40 2723, T40 2373-xxx, R40 2722, R40 2724, R40 2681-xxx, T40p 2374, T40p 2373-xxx, T40p 2373, X31 2672, T40 2376, T40 2375, T40 2374, R40 2897, T40 2373, T40 2374-xxx. Black Diamond Memory offers the most extensive line of memory solutions today. With our decades of experience specializing in memory, Black Diamond Memory is a proven manufacturer to the semiconductor industry. Our great products combined with our world class service and support have helped us to where we are today. When you have an Black Diamond memory chip, you can count on it being the best available memory for your system. Our system specific Branded Memory line delivers in performance, and is designed to be guaranteed in compatibility with your system. Each of our memory chips come with a lifetime warranty for your peace of mind. Use our Upgrade Configurator to easily find the correct memory module for your system. Please keep in mind that this memory will ONLY work on the models listed above. 15% Restocking fee will apply for non-defective items.