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I just went all the way up in TriXX, which I believe is +75mV. I think there's a way to unlock all the way up to +200mV through editing files, but I never tried that. Some people report good success with undervolting too, but I got a hard lock instantly even with -12mV at 1050MHz. I'm not sure about max safe temperatures, but mine never went above the low 70s even when overclocked and overvolted, and still remained extremely quiet. I did have to set a custom fan curve though, as WattMan insists on interfering with default fan curves via its target temperature number. I've seen reviewers complaining about it in RX 480 reviews too.
Thats great, thanks for the reply