So I have a HP ProBook 4540s and according to Crucial.com's advisory tool my RAM should be DDR3 1600Mhz, CL 11, 1.35V and max supported memory is 16GB. - http://www.crucial.com/usa/en/compatible-upgrade-for/HP-Compaq/probook-4540s
I'm limited in my choices due to the region I'm from but this...