FireSword blog: 4GB RAM on Acer Aspire One D270 (AOD270)
CMS 2GB (1X2GB) DDR3 8500 1066MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Acer® Aspire One Aspire One D270, D270-1865, Aod270-1865 - B123 System Specific Memory - Newegg.com
RAM Upgrades | Aspire One D270 Netbook AOD270 - max up to 2GB