You can try running nvOC and then adding AMD driver for your 380x... but the automated setting of power and OC is effective on NVidia, but not on AMD right now.
(Under Linux. Under Windows, AMD tweaking works better. It's a function of the drivers available, so no good solution for Linux, right now. I think that's part of why rxOC gets less attention - until drivers make tweaking more possible, there's not as much demand for rxOC.)
Thing is I don't know how to add AMD drivers, I tried to follow a video but the terminal in nvOC is Nvidia miner :/ Any ideas?
Not my area of skill, but I hope someone can answer you... I'm literally in the process of rebuilding my 6xAMD rig into Windows 10 right now, and will come back to rxOC in the future when it's ready. (All the rest of my rigs are NVidia and are on nvOC.)