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ThinkBook Laptops topics - LENOVO COMMUNITY I would like to upgrade by adding a DDR4-3200MHz SO-DIMM RAM module I tried using a 16GB DDR4-3200MHz Dual Rank (2Rx8) module, but the system failed to boot (black screen) Does this model support DDR4-3200MHz Dual Rank (2Rx8) modules, or is it limited to Single Rank (1Rx8) only? RAM compatibility for ThinkBook 15 G4 ABA - Type 21DL