Motherboards for DDR5 RAM

What will happen if I mix DDR4 RAM and DDR5 RAM in my PC? ddr5 slot compatible with ddr4 RAM generations are not interchangeable You can only use DDR3 with DDR3, DDR4 with DDR4, and so on Can I Use an 8 GB RAM Stick and a ddr5 slot Is it possible to upgrade your older DDR4 laptop to use DDR5 memory? No DDR4 and DDR5 SODIMM memory sticks are not interchangeable

ddr5 in ddr4 slot Even if a DDR5 RAM stick could somehow be inserted into a DDR4 slot, the electrical differences between the two types would prevent the system from functioning