Well his one will use 350 watts during peak gaming as it's Factory OC.
https://www.techpowerup.com/review/powercolor-radeon-rx-6800-xt-red-devil/29.html
But yea, generally it's fine but I like the safe than sorry route since transient load spikes also affects AMD cards as well.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850