A-Tech 4GB KIT (2 x 2GB) for Acer Extensa Series 4010 Series 4100 4100 4120 4230 4420 4610 Series 4620Z Series 4630 4630Z 5010 Series 5200 Series 5230 SO-DIMM DDR2 Non-ECC PC2-5300 667MHz RAM Memory at Amazon.com
OFFTEK 2GB Replacement Memory RAM Upgrade for Acer Extensa 5635Z (DDR3-10600) Laptop Memory at Amazon.com
Acer Extensa 5635 Intel Core 2 Duo CPU T6570 4GB RAM 250GB HDD 14'' Ubuntu 16.04 | eBay
Acer Extensa 5635ZG-443G25MN 2GB DDR3 1066MHz DR SoDIMM