4GB PC3-12800 (1600MHz) DDR3 DIMM Upgrade for Dell Inspiron 660s

PSM Certified Memory Upgrade For Dell Systems: Alienware Aurora ALX, Alienware Aurora R2, Alienware Aurora R4, Alienware X51, Alienware X51 R2, Inspiron 660, Inspiron 660s, OptiPlex 3010, OptiPlex 3020, OptiPlex 7010, OptiPlex 790 DT, OptiPlex 9010, OptiPlex 9020 DT, OptiPlex 990 DT, OptiPlex XE2 MT, OptiPlex XE2 SFF, Precision Workstation T1650, Precision Workstation T1700, Vostro 260, Vostro 270, Vostro 270s, Vostro 470, XPS 8500, XPS 8700