You can also see that running at 20% and 75% give you about the same yield for efficiency, but over 75% it drops off more. Beyond setting yourself up for a much more reliable experience, if you look at the efficiency curve of a power supply, there is a very mild argument to be made about efficiency: As you can see, the most efficient part of the curve is at 50%. Also, the 3080ti is going to be closer to a 3090 for spikes than a 3080 as it is much closer to that chip under the hood. EVGA even had to revise their 850W power supply design and RMA them for people so they didn't have issues with 30-series GPUs. Still some, yes, but those are generally quality issues and end up with GPU RMAs. There are a lot less people having problems with 3080's and 3090's with 1000W+ PSUs. Most CPUs don't spike as high as the 11900k, especially if you overclock it and don't lock it down to 125W (why would you buy this thing if that was your plan?). There are a lot of people that had issues with 750W and even 850W power supplies (plenty that worked ok too), but there's a reason that is listed as the minimum size. the 11900k can draw 250W at times and the 3080/90 series has some pretty high current spikes. I would go 1000W (I can back this up because I already did lol).
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