Is this gpu only or are you using the newer xmr-stak that incorporates cpu as an all in one? On some of my Vega rigs, I run Ryzen 5 1600 that do quite well together
Yes its gpu only. My own rigs are B250's with cheap i3 processors that each run 13 vegas, so there is not much cpu power to harness. But I think its a trivial task to start a separate cpu miner if you should want that, it does not necessarily have to be built-in