4Gb (2X2Gb) Memory Ram Compatible with Acer Aspire X3 Ax3950-Ur30P, Ax3950-Ur31P Desktops Ddr3 By CMS (A81) 240PIN DIMM DDR3 NON ECC PC3-1333MHZ DIMM DDR3-PC10600 DIMM 2PCS KIT