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Power consumption on the 4090 will be higher for sure, I've read they will be rated at 450w and spike at 600w - likely more on the after market OC models (but not enough to justify the need of a 1600W PSU with just 1... assuming you have a 1200 or 1300w psu now), the only way you would "need" this much power is if you had an actual need. Like a combination of multi-pump custom cooling loops, or SLI (like two xx90s for and a high end cpu for sure), multi CPU motherboards, or extremely large HDD arrays and maybe insane RGB setups (it would have to be next-next level RGB though, like 40+ rgb fans and dozen+ of strips etc) even with all that you'd still have headroom.
The main selling point to buy a PSU with this much wattage (if you don't have a need for it) is that if you intend to keep it through multiple generations of PC builds...it will last longer. As PSUs age their performance degrades and their rated output wattage drops over time, so a lot of headroom ensures you can degrade over time and still have a useful PSU long term.
With the new connectors coming you might want to hold off just for that.
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