Lenovo ThinkPad X40 2386 compatible 256MB 333MHz DDR SO-DIMM Black Diamond memory. Compatible computer model: Lenovo ThinkPad T41p 2378, R51 1836, R50e 1834, T42 2373, T42p 2374, T41 2379, R50 1829, R50e 1846, R50e 1860, R50e 1843, R51 1830, T41 2374, X31 2672, T41 2378, R50 1840, R51 2883, G41 2886, T41 2376, X31 2673, R50 1836, T41 2373, T42 2378, R50e 1859, X40 2371, G41 2388, R50e 1848, T41p 2374, G41 2882, T41p 2373, X31 2885, X32 2885, X40 2382, R51 2887, R50e 1842, A31p 2652, G40 2388, T42 2379, R51 1829, T42 2376, R50e 1844, R51 2889, X31 2884, X40 2372, X40 2386, R50e 1849, X32 2672, T42, R50 1841, G41 2881, R50p 1832, R50p 1833, T42 2375, R50e 1847, R40 2897, R51 2895, R51 2894, R40 2896, R51 1840, R50 1830, R50 1831, T42p 2379, T42p 2378, T41p 2379, R51 1831, R51 1841, X32 2673, T42p 2373, X32 2884, R51 2888, T42p 2376, T42 2374. 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.