Manual overclocking headroom for the RX 6700 XT is decent, despite the GPU clocks already being significantly higher compared to the RX 6800. Using AMD's driver-based software, I maximised the power limit at 115%, and could then increase the GPU frequency slider up to 2900MHz, with the memory set to 2130MHz.
This increased our real-world average clock speed by 285MHz, very nearly reaching 2.8GHz on the core.
As a result of this increased frequency, we saw an 8% boost to frame rates in both F1 2020 and Gears 5, when testing at 1440p. In Watch Dogs: Legion, we saw an extra 6%.
Meanwhile, power draw increased by 21W, or an extra 9% compared to stock behaviour.