My fatal1ty z170 gaming k6 motherboard has 4 memory slots. I am using 2 of them with G.SKILL Ripjaws V Series 16GB (2 x 8GB) 288-Pin DDR4 SDRAM DDR4 3200 (PC4 25600) Desktop Memory Model F4-3200C16D-16GVKB.
So that leaves me with 2 empty slots. One of the empty slots can't be used because the CPU fan is in the way.
My question is, does memory still need to be installed in pairs?
So in that one available slot, can I put a 16 MB stick in there, or would it be better to put an 8 MB stick like the other ones that are installed?