4GB KIT 2x 2GB For Acer Aspire X3910 AX3910-xxx X3910-CEL2GB X3910-PDC3GB X3910-U4022 X3950 X3950-B3062 X3950-i33GB X3950-U3022 X3950-UR30P X3950-UR31P DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory 4GB KIT (2 x 2GB) DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Acer Aspire. (See Compatibility List Below)