Comment Re:Can you re-use old DDR3 or DDR4? (Score 1) 47
There are some motherboards which will let you use DDR4 with an AM4 processor, and AM4 processors have made sort of a comeback with AMD bringing back production of some higher end parts which remain competitive.
Though I actually built this as the AM5 stuff drove down the prices rather than going back and doing it, I run a 5900X (12C24T 3.7-4.8 GHz) and it remains a beast given the costs. I use 4x CP16G4DFRA32A.C8FF for 64GB dual channel, and the mainboard is an ASRock B550M PG Riptide. It's been absolutely solid, though ASRock has had some lemons and the RGB on this board is lousy.