32GB KIT (2 x 16GB) For IBM-Lenovo System Series x3620 M3 x 3630 M3 x 3650 M4 x 3690 X5 (7147-xxx 7192-xxx). DIMM DDR3 ECC Registered PC3-12800 1600MHz Quad Rank RAM Memory. Genuine A-Tech Brand. 32GB KIT (2 x 16GB) DIMM DDR3 ECC Registered PC3-12800 1600MHz Quad Rank RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For IBM-Lenovo System Series. (See Compatibility List Below)