1GB KIT (2 x 512MB) For Gateway MX Series Notebook MX6121 MX6123 MX6124 DDR2 MX6124h MX6128 MX6130j MX6132j MX6134j MX6135 MX6211b MX6214 MX6215b MX6216 MX6217j MX6243m MX6243m MX6243m. SO-DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory. Genuine A-Tech Brand. 1GB KIT (2 x 512MB) SO-DIMM DDR2 NON-ECC PC2-5300 667MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For Gateway MX Series Notebook. (See Compatibility List Below)