Questions on memory

[Berosar]

I want 16gb memory and my old pc had 2x4gb so can i buy two new 2x4gb and get a 4x4gb? I it also possible to get a 2x4+8gb? And can i do either of these on this motherboard: Biostar - B250GT5 ATX LGA1151 Motherboard.

 

This will be my first PC build and I want 16gb for sure... just trieing to figure out if i can keep the old memory and add on other stuff. The old 2x4gb is DDR4 but I dont remember anything else off it.

[porina]

4x4GB would be my choice to maintain dual channel mode. As long as you aren't aiming for high ram speeds it should be fine. Put 2 matched modules in dual channel as you would normally, then add the other 2 in the other slots. You might even see an overall improvement in performance by having multiple rank per channel by doing this, but I've not tested unmatched ram in this scenario. If you can find out what your old ram is and try to get that, it would help with matching, but ram manufactures may vary the design silently over time anyway so that isn't guaranteed.