The Ryzen CPUs seem to be designed to spike as high as whatever thermal limit you configure with Precision Boost Overdrive.

Does your motherboard have auto-oc enabled? Have you checked what voltage it's using? Have you tried setting a negative voltage offset and stability testing? Some motherboards will apply 1.3v+ when 1.2v is plenty.

Then you need better cooling. The stock coolers are pretty mediocre.

The 5800X didn’t ship with a stock cooler IIRC. Mine is cooled with a 360 AIO + PTM7950, the thing just runs really hot when all cores are hitting ~4.4GHz.

Mine runs at 60C when running Prime95 at full load, i got a open bench case though.

The 7000 series is designed to hit those loads, i wonder how your 5000 series can even reach that.

This is where the 5700X shines. 8 cores, still cool.

The 5700X has the same 8 cores as a 5800X3D but with a slightly higher maximum clock speed (the X3D CPUs tend to have lower maximum voltages because the extra cache die doesn't tolerate voltages as high as the CPU cores do). The only reason the 5700X is running cooler for you is because it comes with a 65W "TDP" setting out of the box rather than the 105W "TDP" setting used by the 5800X3D. If you configure a 5800X3D to operate at the same power limit, it'll give you generally better performance than a 5700X.

In general, buying a power-limited desktop CPU has never been a good strategy to get better efficiency. You can always configure the full-power chip to only use that extra headroom for short bursts, and to throttle down to what you consider acceptable for sustained workloads.

I got the 5950x at launch for stupid money. I have no reason to part from it.

And the 7900 ! (AM5 though)