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