Disclaimer: Acer is a registered trademark or Acer Incorporated 4GB 204p PC3-8500 CL7 8c 256x8 DDR3-1066 1Rx8 1.5V SODIMM. Manufactured by Computer Memory Solutions We dont use OEM or Generic Brands to avoid incompatibility Lifetime Warranty. 30 day Money back guarantee Compatible with: Acer Aspire One AO722-0418, AO722-0427, AO722-0472 Standard Memory: 1 GB (Removable) Maximum Memory: 1 GB with Windows 7 Starter 4 GB with other operating systems Expansion: 1 Socket(s) t(s) In order to upgrade to maximum memory, you have to remove the 1GB Module from the socket and exchange it with the 2GB Module