It looks like the the Power Slider on the RX6800/XT only increases by 15% maximum.
They must be very close to the edge of instability w.r.t. Power Limit then.
That is not much compared to RX Vega 64 + 50% or RX5700XT + 50%
I am still trying to find out how much RAGE Mode increases the Power Slider by.
On RX Vega 64 Liquid setting Turbo Mode (which is ~same a RAGE mode idea) in driver preset increases power slider by 25%.
I still try to find out if there an option to report both GPU Power and Total Board Input power in Adrenalin 2020 20.11.3 on the RX6800XT now.
Or if you can only report GPU power.
AMD should be able to monitor and report Total Board Input power on RX6800/XT based on the smart power devices used in the VREG.