Regarding the NH-D15, it's performance isn't drastically different vs the NH-U14S.
The Noctua coolers are great for 10th-Gen CPUs.
If you want maximum performance from a 12900k (or 5950x), you need more robust cooling.
CPUs with 16+ cores have larger temp swings (under load) then previous generations.
You can build a quiet 12900k or 5950x based machine...
But it's more complex than dealing with the 10900k.
Same is true with the 10980xe.
Air-cooling just isn't enough when the CPU is under substantial load.
