2GB DDR2 SO-DIMM Upgrade for Acer Extensa 4120 4420-5239 5420-5120 5420-5232 5620 Notebook PC2-5300 Computer Memory (RAM) 2GB DDR2 SO-DIMM Upgrade for Acer Extensa 4120 4420-5239 5420-5120 5420-5232 5620 Notebook PC2-5300 Computer Memory (RAM)