Could have you installed ram with spreaders on useing that cooler ? i like the ripjaws ram but could be to high ? with the dh14 cooler, ram i like is 42mm high.
you won’t be able to use memory modules higher than 44mm
http://www.noctua.at/main.php?show=compatibility_ram_gen&products_id=34&lng=en#DDR4_G.SKILL