I mean, you never want to have your PSU be close to your actual consumption. You should hook your machine up to a kill-a-watt and measure. Lets say it's 760w, then you can comfortably get a 900 or 1000. But 1200 seems overkill for what you're doing. I could be completely wrong on your consumption, I'm just throwing numbers out there.
I had an 850W Gold PSU with a 5950x and a 3090 FTW3. It would trip in games shutting off the computer. Even if the 3090 spiked to 500W and the CPU was ~150W, I should have had plenty of wiggle room, but it kept shutting off in games.
I happened to have the 1200W P2 sitting around, and I haven't had an issue since I installed it. I RMA'd the 850W PSU back to EVGA, so hopefully it got fixed/replaced.