RIP Socket AM4.
https://wccftech.com/intel-confirms-sapphire-rapids-processors-in-2021-with-ddr5-pcie-5-0-and-cxl-1-1/
DDR5 will likely be for servers first where larger density is needed
DDR4 16 gigabit chips are still mass produced but DDR5 specs 32 gigabit and 64 gigabit logic which will afford some DIMM capacity up ticks. 128 gigabit may be added down the road.