Any module you install that is faster than the one you already have installed, will be running at the same JEDEC standard speed of 2133Mhz and CL15 timing of your original 2133Mhz CL15 module. It doesn't really matter what you buy as long as it's as close in spec to the original module as possible. Make sure it's the same type (DDR4 SODIMM 260pin) and has the same amount of ram chips on each side of the module. It will likely be a single rank module which is chips on 1 side.i want to buy a ram for my asus x556uq r558 notebook i7 7th, 2gb 940mx
it has preinstalled 2133 8 gb cl15 ram. can i install 2400 8 gb cl 17or cl19??