4GB KIT (2 x 2GB) For IBM-Lenovo IBM-Lenovo ThinkCentre M58p (7347-xxx) M58p (7357-xxx) M58p (7358-xxx) M58p (7483-xxx) M58p (7484-xxx) M58p (7630-xxx) M58p (7635-xxx) M58p (9964-xxx) M58p (9965-xxx) M70e M70e (0806-xxx) M70e (0809-xxx) M70e (0822-xxx) M70e (0829-xxx) M70e (0830-xxx) M70e (0832-xxx) M70e (0833-xxx) M70e (0842-xxx) M70e 90843-xxx) M90 (3245-xxx) M90 (3246-xxx) M90 (3491-xxx) M90 (3544-xxx). DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. 4GB KIT (2 x 2GB) DIMM DDR3 NON-ECC PC3-8500 1066MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For IBM-Lenovo IBM-Lenovo ThinkCentre. (See Compatibility List Below)