It's just hard to tell what the spikes will look like on the 4090 and what the max power draw will be for high-end CPUs. If the 3090 is spiking over 650 could the 4090 hit over 750? A 1000w PSU is probably going to be okay anyway I guess provided your CPU doesn't get into that 300 range (12900ks has been shown to be able to get close to that). Getting a little closer though.
Incidentally it's pretty hard to figure out what is going on with system power in Ubuntu, I'm finding. A lot of stuff on Linux either doesn't work, or did but breaks when something updates. I can't get an overlay a la Afterburner to work, and apparently it's a known issue. I might have to abandon this Linux thing just for the sake of convenience.
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