Main issue with P550 is no V. Huge handicap, can't easily make up for that.

RVA23 requires V. These incoming CPUs are the real deal, a perfectly usable performance level in the present day.

(unless they cache-starve them or some other such fuck up)

My 4790k was still my main PC until I recently (weeks) built a new PC with 9800x3d, 96GB ECC, rx7900gre.

4790k had 4 cores. If these new chips clock reasonably, say, 3+ GHz, and have 8 or 16 cores, they'll easily generally outdo this old -but very usable still- Intel chip.