Brian D Smith: I get your point, but the Intel i9-13900K (the competitor to the Ryzen 9 7900X3D) supports both DDR4 and DD5. Therefore, Paul's feedback on this particular issue is warranted. AMD's design decision to switch exclusively to DDR5 is a detractor to many buyers, including myself, who would have upgraded their CPUs but can't because they would have to invest in DDR5. Conversely, Intel has eased the transition its 12th generation processor by offering compatible motherboards with either DDR4 or DDR5.
I would guess that Intel's 14th generation will ditch DDR4 for good, but as of now, DDR4 compatibility is one thing that the i9-13900K has going for it over the Ryzen 9 7900X3D.
Disclosure: I hold positions in both Intel and AMD stock and use predominantly AMD products.