Will DDR4 3200 ram be compatible with a z690 DDR5 motherboard?

In past DDR gens , servers handled UDIMMs and RDIMMs interchangeably In DDR5, they're not compatible; RDIMMs and UDIMMs are no

DDR5 can use densities of up to 64 Gb DRAMs in a single-die package , where DDR4 maxes out at 16 Gb DRAM in an SDP Higher device capacity

canyonlands slot canyons DDR5 RAM Sticks Aren't Physically Compatible With DDR4 Slots Given the difference in voltage requirements and other crucial modules, DDR5 RAM

can i run a pcie 40 in 30 slot He says that the platform will support DDR4 and DDR5, just like Alder Lake does That's great for builders who are upgrading now but can't