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1000 watts is plenty for a 4090 as long as you are getting the psu from a reputable brand. I have 1000 watt psu and I use my 4090 Strix. I was able to overclock it to it's maximum and run at 600 watts during benchmarks without any issues.



                  

PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850