@Claymore, few questions:
1) -cclock: you wrote "you can overclock only", but it seems not to be true for, at least, Windows and Polaris. My 470x can be underclocked (GPU set to 1150 for all states).
2) Any chance to support -cclock and -mclock on Linux for amdgpu-pro drivers (for Polaris)? It is not said "unsupported on Linux", but does not work for me (mem can't be set to 1950 using this).
3) Any chance to support -cvddc and -mvddc on Linux for amdgpu-pro drivers?
4) Are older cards like 7950/7970 supported using amdgpu-pro drivers on Linux?
5) There is an issue on Windows when used -*clock commands: they are applied at some init stage, but for my 470x it instantly changes hashrates only for the card with monitor connected. I can stop and resume other cards for changes to take effect (and show correct/new hashrate), but probably makes sense to fix it somehow, so miner shows correct hashrates after applying values. Of course, if you run it for 2+ time, drivers keep settings and there is no that effect. Still, it is surprising when you run minr with some value and it is not reflected in hashrates.
1. AMD disabled underclocking in theri drivers in past. May be it enabled it again in recent drivers, I did not check it.
2. Linux requires root access for it, I remember someone said that even sudo is not working.
3. Did not check if it is possible.
4. I did not check it.
5. So if I take two 4xx cards, start miner with -*clock option and it will change clocks only for one card?