1GB Memory (PC2-6400, DDR2-800MHz) for Compaq Presario Notebook CQ40-609TU OEM Part # equivalent: 451398-001, 480860-001, 482168-001, 482168-002, 482168-003, 482168-004, 484267-002, 484380-001, 485032-004, 493194-001, 496110-001, 506060-001, 506932-001, 536427-001, GM254AA, KT292AA, KT292ET, KTH-ZD8000C6/1G |