My buddy built a rig - 5800X, b550, Red Devil 6900 XT. He's running high frames at 1080p (240hz monitor). I'm not local to him or I'd go check it out. While monitoring the GPU clock rate dips very rapidly every like second. According to HW Monitor and Radeon its only pulling like 50-70W. Been trouble shooting with him two days now. Power settings, OC settings, Radeon Settings, Gen 4 then Gen 3 in bios, connections, DDU and fresh drivers, fresh windows, everything I can think of. He only plays Warzone - So we started with every single setting we could on that thinking it was Warzone specific, I had him run some other benches and it appears there as well though it is not as bad. He told me he put in a EVGA GQ 850W 80+ Gold PSU. The box recommends 900W - I've started thinking that possibly may be the cause, but I would have thought he would get random shutdowns. He's stubbornly on his way to exchange the PSU for the same PSU thinking that one is defective. We've also tried the bios switch on the GPU.
It's hard for me to troubleshoot without having the PC and switching out part for part to test. Any recommendations are appreciated. Thanks!