Wolodymyr
Yeah the 10980xe would draw about 530w at 4.8GHz. The highest I saw was 560w on the Asus X299 prime with the stupid MCE on was bouncing 11 cores at 110C benching on R23 and I shut it off quickly. Surprisingly that was with my SuperNova 1050G  from 2015 and my 2080 super (drawing 290w) and I never had a shutdown due to a kernel event 41.

 
*insert every "mother of god" and "daaaaaaaaaaang" meme you can think of here*
 
That's...a lot of power.

Wolodymyr
Yeah the 10980xe would draw about 530w at 4.8GHz. The highest I saw was 560w on the Asus X299 prime with the stupid MCE on was bouncing 11 cores at 110C benching on R23 and I shut it off quickly. Surprisingly that was with my SuperNova 1050G  from 2015 and my 2080 super (drawing 290w) and I never had a shutdown due to a kernel event 41.
 

Geez that is a lot of power for a PC haha. Are you also working with DOD and launching drone strikes or missiles from home? I went with a more detailed power calculator and after plugging in all my components and like 7 usb items it did tell me 850w should be enough. But yea, if you are overclocking and adding additional components, its good to keep in mind.

B0baganoosh

Armathyx

Nike_7688
I would go 1000W (I can back this up because I already did lol). the 11900k can draw 250W at times and the 3080/90 series has some pretty high current spikes. 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. 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 less people having problems with 3080's and 3090's with 1000W+ PSUs. Still some, yes, but those are generally quality issues and end up with GPU RMAs. 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. That should be a clue. 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.

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%. 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. I've never been a fan of running a PSU over 75% load all the time, and I have occasionally had to factor in folding@home into my usage, which can crank up your power usage quite a bit more than normal loads (when else do you crank up CPU and GPU at the same time for extended periods?), so I wanted that 100% full-system load to never be more than 75% of the PSU's rated max load. If your normal usage is between 25-65% of a PSU's rated load (between idle and normal gaming or normal work-loads), you're in the most efficient area and should have plenty of head-room for those spikes I was talking about before.

A wise man named Burt Gummer once said "I'd rather have it and not need it than need it and not have it." Yes, he was a fictional character in a silly movie, but sometimes that adage rings true.

finally, the bronze, silver, gold, etc. ratings don't always indicate how "good" or "well rated" a power supply is for various loads. It just indicates that it meets a certain efficiency rating. Generally, the quality of components goes up with most manufacturers the higher that rating is, so having gold/platinum/titanium generally means the PSU is better than a bronze, but having platinum or titanium does not always mean that the supply has better current-spike handling capability and not all golds (or any eff. rating) are made equally. Read reviews. Find a review where they actually opened the thing up, checked build-quality, and did some testing.

The "50% efficiency" argument is bs.

While it drops more from 75% onward, you'll notice on the left that the drop only represents around 2-3% efficiency drop.

A PSU only requires having 50-100w more power delivery than the total amount (power spikes included) your system theoretically pulls at full power. Do note this is also theoretical full power, for you to get there you would need to run a very GPU intensive task as well as a very CPU intensive task simultaneously.

Also, this is considering a high end CPU, which not everyone runs/needs for gaming.

Don't take my word for it, here's a reliable source detailing power requirements with various GPUs:

https://www.guru3d.com/ar...-founder-review,6.html

I said it was a very mild argument. I just gave the data to show why it exists and just as you did, let people take their own conclusions from that. Also, that was one curve from one good supply. They do vary. (Edit: I also said it was very rare to draw full load from both CPU and GPU at the same time.)

As for what hardware people are running, he literally said 11900k with an EVGA 3080 ti. My suggestions are based on owning an 11900k (so I can first-hand see the power numbers there), and posts on these forums from people who own EVGA 3080s and 3090'S. Yes, the EVGA cards will draw more power than the founders edition, unless you underclocked them...(Edit: if you don't trust EVGA forums members, here's a reddit thread where they talk about how Seasonic told them they see the 3090 pull 550W spikes and that's probably what's causing his 850W PSU to shut down that doesn't have the issue with a 1000W supply...I was on my phone when replying earlier so I didn't feel like finding links lol sorry).

I dont know why folks are so hell bent on having a PSU with "just enough" under the hood....I've been building Gaming PC's for many years now, including multi GPU (not after 1080Ti series) Water Cooled set-ups and have always believed in purchasing a PSU with ample power (I do believe in the 50 - 60% efficiency curve and more importantly a "quite running" PSU.
If you're going spend the big bucks on a GPU, MOBO, CPU and RAM, then why wouldn't you want to spend a bit more on a PSU (the heart of your system)....also, a PSU is one component that literally can be considered "future proofing" ......a decent PSU will come with a 10 yr warranty.

I think that something around 750-800w will be enough.

definitely go for more on the power side of things because you are better safe than sorry and it will make your build quieter.