This Chinese motherboard supports DDR4 and DDR5 RAM

Just to clarify DDR5 is not backwards compatible with DDR4, it's a completely different DIMM slot There will be DDR4 and DDR5 Alder Lake

Like the previous generation transition between DDR3 and DDR4, each manufacturer's Z690 series all also have versions that support DDR5 and DDR4

ddr5 slot Up until then, the most recent iteration of DDR was DDR4 DDR4 has up to 16 GB of memory capacity per RAM chip, Gbs data transfer rates,

ddr5 in ddr4 slot 2DPC with Mixed DIMMs means two different DIMM part numbers are populated in each memory slot within a single 2DPC channel One and two