2GB DDR2 SO-DIMM Upgrade for Toshiba Satellite A105-S4074 A105-S4084 A105-S4164 A105-S4201 A105-S4254 Notebook PC2-4200 Computer Memory (RAM) 2GB DDR2 SO-DIMM Upgrade for Toshiba Satellite A105-S4074 A105-S4084 A105-S4164 A105-S4201 A105-S4254 Notebook PC2-4200 Computer Memory (RAM)