8GB DDR5 vs 16GB DDR4 RAM: Performance Comparison

Intel® Xeon®, the lineup of Intel® Core™ Processors, and the AMD EPYC™ Processor Family will support DDR5 ECC RDIMMs Two Channels on One DIMM

No, the slots are physically incompatible so you can't accidentally insert DDR4 into a DDR5 slot

can you put ddr3 in a ddr4 slot You cannot use DDR5 RAM into DDR4 motherboard socket Since DDR4 and DDR5 memory

candy blasted! slot If you already have or if you intend to assemble a computer using an AMD Ryzen 5000 series or previous generations, then you can only use DDR4,