READ EDIT FIRST.
so boy i got my shit togheter and have made a choice, more RAM!!! but now i got another problem. laptop, 1 slot used 8gb stick. 1 open. if i buy the same stick it will "probally" work. now that worries me. this probally comes from the fact theres a such thing as single dual and triple and quad channel for ur RAM sticks. now if the 1 stick in my system is single stick and i buy another single, does that work optimally? do i need to buy a 8gb dual stick? HELLPPPPP
EDIT EDIT EDIT EDIT IMPORTANT: READ FIRST
i just watched a video where it says it doesnt matter because u dont buy either one, its just terms for how u configure them into the motherboard, so sorry!