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