Vega 56 with Samsung Memory, conservative power settings, cvddc and mvddc 900, cclock 1200, mclock 940.
Perfectly stable for days with 1.8.1, ~1800 H/s.
With tweak settings, HBB goes boom and starts hashing @ 1100 H/s.
Reduced memory clock to 900 and set voltage to 950 mv. Can go up to 3, just as fast as 940 Mhz memory with 1.8.1 and no tweak (obviously).
Tweak setting 4 gave imediate screen corruption.
Should I test it with default memory clock?
Even at profile 1 you should have a minimum 5% increase.
Clocks are ok, vddc is ok, so i don't really get it why you get lower hash.
Did you just use + - , or set the profile in the config file ?
If only + -, there's a bug i fixed, it will be released in a day.
No, I set the profile in config, and setup 1.8.4 from scratch.
Maybe because of Samsung memory? (Reported by GPU-Z)
Some Vegas are a bit finecky with memory overclock and disable HBM, starting to hash at much lower speeds. You have to reset the card to get it working again. I got it from too much memory overclock, and lowered it to 940 until it fully stabilize. No problems now, still haven't upgraded from 1.8.1 because it's really stable with my 480/580/Vega 56 rig.
Samsung is ok, you should use the --resetvega switch, which is mega recommended if you have Vegas.. It disables/enables the gpu before mining.