Review on 32GB Memory Upgrade Kit For Laptops: Timetec DDR4 2666MHz PC4-21300 Non-ECC Unbuffered RAM Modules (2X16GB) With 2Rx8 Dual Rank And 260 Pin SODIMM Design, Ideal For Notebook PC And Computer Upgrades by Carlos Long

I tried a Samsung before and It was not compatible even when Lenovo URL mentioned as one of the substitutes. Then I Timetec Hynex and it works very well.I just had to check as well with a specific HW checker program what was the original installed memory speed in my case it was 2666Mhz then I ordered this one with the same speed. Even when task manager in windows says 2400 the real speed is 2666. It has to match original speed otherwise the clock conversion could cause performance issues.