4GB DDR3 PC3-8500 1066mhZ 204Pin SO-DIMM Memory RAM FOR Toshiba Satellite A665D-S6051 Lifetime warranty 4 GB DDR3 PC3-8500 SO DIMM Dataram, a trusted brand name since 1967 100% compatibility guarantee or full money back Compatible Lenovo Thinkpad T410 2516 2518 2519 2522 2537 2538 2539