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