Comment by toast0

DDR4 machines are relevant and usable, but it's pretty unusual that new systems on older ram are still big sellers. The 5800x3d was originally released in 2022, AM5 processors were also originally released in 2022. We'll probably see Zen6 soon, the third generation on AM5... I don't think AMD released new AM3 processors after the introduction of AM4, certainly not when Zen3 was coming soon.

When making long term plans in 2022, I don't think anyone expected DDR4 to need significant production in 2026. Since ram makers can pretty much sell whatever they make in today's marketplace, it makes sense (for those fabs that can) to stop making DDR4 and repurpose those fabs to make newer generation ram.