512MB STICK For Toshiba Toshiba Satellite A50-AG1 A50-S135 A50-S310B A50-S310G A50-S311B A50-S311G A50-S330B A50-S330G A50-S331B A50-S331G A50-S332B A50-S332G A50-S333B A50-S336G A50-S430B A50-S430G A50-S431B A50-S431G A50-S432B A50-S432G A50-S530B A50-S530G A50-S535B A50-S535G A50-S536B A50-S536G A50-S537B A50-S537G A50-SP306 A55 (DDR) A55-S106 A55-S1063 A55-S1065 A55-S1066 A55-S1271. SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory. Genuine A-Tech Brand. 512MB STICK SO-DIMM DDR NON-ECC PC2700 333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Toshiba Toshiba Satellite. (See Compatibility List Below)