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There's really no way of knowing without an inside insight into Sapphire's binning and testing process. Not to mention the inherent silicon lottery of each individual chip. You're probably giving yourself the best chance of a good overclock with the OC+ model, but I wouldn't worry too much about it if there's a large price difference.
My Nitro did 1120/550 on stock voltage and 1150/550 with voltage and power limit maxed in TriXX, although I never actually tried to push it beyond that before I sold it. Of course, maybe that was an exceptional chip (no extra shaders to unlock though, sadly).
From what I can gather, the Nitro is the best overclocker of any of the Fury cards. It did release six months after the others, so maybe benefitted from some maturation somewhere, or perhaps simply a better design. It has a custom PCB, whereas the Tri-X is a reference board.
What voltage did you have to add? Also what were your max temps? Also do you know the max safe temps? I know my airflow isn't great as have rads just wanted a comparison really
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.
