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 X201 Lenovo ThinkPad X201 Tablet Lenovo ThinkPad x201i Lenovo ThinkPad X201s