4GB PC3-10600 DDR3-1333 CL9 16c 256x8 204-pin SDRAM SODIMM. Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Compatible with: Lenovo ThinkPad X200 2024-xxx Lenovo ThinkPad X200 7454, 7455-xxx Lenovo ThinkPad X200 7457, 7458, 7459-xxx