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You sure that's a good idea? I'm forever telling people they don't need as much PSU as they think, but 750W for a 5950X and 3080Ti sounds pretty close to the minimum.
It might be ok, but I wouldn't be comfortable risking it. Doesn't seem worth it for the very minor benefits.
Brun-
Reasonably sure: https://uk.pcpartpicker.com/user/buro9/saved/jpq3wP (with the current spec of actual components I have selected)
Component Estimated Wattage
AMD Ryzen 9 5950X 3.4 GHz 16-Core Processor 13W - 105W
Noctua NH-D15 chromax.black 82.52 CFM CPU Cooler 5W - 10W
Asus ProArt X570-CREATOR WIFI ATX AM4 Motherboard 17W - 70W
Crucial Ballistix 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory 29W
Crucial Ballistix 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory 29W
Seagate FireCuda 530 4 TB M.2-2280 NVME Solid State Drive 2W - 10W
Asus GeForce RTX 3080 Ti 12 GB TUF GAMING OC Video Card 87W - 350W
Fractal Design Prisma AL 103.85 CFM 140 mm Fan 1W - 5W
Total: 608W
Velocio
Oh I changed something in my spec. Dropped the PSU to 750w. Fractionally more efficient, runs quieter, and for what I've gone for I won't need the extra overhead for a very long while if at all.