NeweggBusiness - G.SKILL 16GB (2 x 8GB) 204-Pin DDR3 SO-DIMM DDR3 1333 (PC3 10666) Laptop Memory Model F3-10666CL9D-16GBSQ
2GB RAM Memory for Acer Aspire E1-571-6492, E1-421, One (521), One (522), One (533) Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-10600 1333MHz Upgrade System Specific Memory - Newegg.com