You can tell by watching review roundups, e.g. this review includes thermals, noise and power for:
6800 XT Speedster (XFX)
6800 XT Strix (Asus)
6800 XT Red Devil (PowerColor)
6800 XT Nitro (Sapphire)
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Each brand also has a hierarchy within that range, e.g.
Pulse, Nitro (low to high, Sapphire)
Dual, TUF, Strix (low to high, Asus)