Arch Memory 2 GB (1 x 2 GB) 240-Pin DDR3 UDIMM for Acer Aspire X3400 AX3400-U2012 RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 2GB 240-Pin DDR31333Mhz SDRAM 2 GB Memory for Acer Aspire X3400 AX3400-U2012 by Arch Memory Lifetime Replacement Warranty