The 5800X3D barely beats the 12600K (and often doesnt). The 13600K will beat it soundly (even at stock), and is cheaper. You can use a 600 series motherboard with it, and it still supports DDR4. There is no world in which the 5800X3D is the better choice over the 13600K, especially since they are now 14 cores/20 threads.
Because of how DDR5 has been packaged, 2x8 is a poor financial choice, since it isnt a lot cheaper than getting 2x16. Hes also going to potentially be doing video editing and renders on this rig. Given the lack of substantial savings by only going with 16GB (2x8) there is no point to not getting 32GB.
Since he straight up said hes getting a 3070Ti or better, im not even sure why you brought this up.
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You can safely totally ignore this (the PSU thing).
As long as the PSU has enough power on the correct rails, and the right plugs, it will work just fine. This isnt a 12vO board. Also, i'd get a Seasonic over an EVGA, not that EVGA's PSUs are terrible or anything. But Seasonic has a much better warranty and their customer service is even better than EVGAs.
As for RAM compatability, all that is is a list of stuff tha ASUS has tested with the board. Especially with Intel, this is usually a non-issue (AMD's memory controllers tend to be a bit more tempramental). Ive literally never had a set of RAM not work with an Intel chip at its rated XMP, regardless of wether or not it was on the QVL list. Just stick to a decent brand and youll be fine.
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https://pcpartpicker.com/product/jWF...pply-ssr-850fx
Is the Seasonic unit i'd recommend. You might want to kick it up to a 1000W for potential "future proofing" of a higher-end GPU, but honestly i think by the time you're seriously contemplating replacing the GPU you're going to have to replace it anyway due to them switching to new ATX 3.0 connectors.