My 6900xt Reference runs on a 850 Seasonic and is happy.
same here
I do have one exception going on. Hitman 3 def is making this GPU, which is new to me in the last few weeks, spike in power. I do not overclock the GPU but when I run Hitman 3 there is a chance it makes my PC crash where upon restart you get that AMD Radeon message stating "Default Radeon WattMan Settings Have been Restored due to Unexpected System Failure" normally indicating poor OC or UV settings.....but I was using default settings already. I've never seen this message except when I was doing custom settings, so I knew I was the problem and would change settings accordingly to get stable performance. So the only explanation I can think of here is there is a severe power spike going on. This GPU default PPT is ~255W under default settings. The most I've seen HWInfo list power draw at was 257W which is totally fine and within range of my system capabilities. So there must be a big 'ol spike happening during heavy load scenes for this game. I really should turn on my 2nd display, put HWInfo up over there, and see if it lists this power spike when this crash happens....bc I cannot check the HWInfo window when it's on the same display as the game once the PC freezes up and automatically restarts when this happens.
this only happens with Hitman 3, and I can power limit and limit the clock and it happened much less frequent to point I thought I was in the clear after a couple plays, but it still happened eventually. Game still runs well at 4K full blast max settings, but I have to reduce to 1440p to stop this from occurring, thought I was in the clear, but it even happened once on 1440p! Only once, but still....
So I'd say 850W is bare min, which is most of the review worlds general consensus, but 1000W+ is the true "safe zone" from consumers/users feedback