4GB Memory (PC3-8500, DDR3-1066MHz, 1.5v) for Hewlett-Packard Envy Notebook 13-1101tx OEM Part # equivalent: 572294-D88, 575480-001, 577606-001, 599092-001, 599092-002, 621569-001, AT913AA, AT913ET, AT913UT, BV075AV, NU466AV, NU495AV, NU581AV, VB521AV, VB821AV, KTH-X3A/4G |