16GB KIT (2 x 8GB) For IBM-Lenovo Thinkpad Notebook Series E430c E431 E530c E531 E535 E545 S430 S531 T430 T430i T430s T530 T530i W520 (4 Slots) W520 (Dual Core) W530 (Dual Core) W530 (Quad Core) X230 Tablet X230i. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory. Genuine A-Tech Brand. 16GB KIT (2 x 8GB) SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For IBM-Lenovo Thinkpad Notebook Series. (See Compatibility List Below)