TBH, I don't know. If you can borrow 2 sticks (even with lower capacity) from someone, try it. It might help (but I wouldn't expect hudge change). Also lower timmings / higher memory clock might help a bit.

I expected much more performance from Ryzen 1600 - about 700 h/s. But maybe I was just wrong.
Ryzen 1700 (8C/16T) was able to get about 2 x more hashes when minning XMR (comparing to my rig).