What will happen if I mix DDR4 RAM and DDR5 RAM in my PC?

What will happen if I mix DDR4 RAM and DDR5 RAM in my PC? ddr5 slot compatible with ddr4 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 Physical Differences: DDR5 and DDR4 RAM sticks have different notches or key positions This means a DDR5 RAM stick won't fit into a DDR4 slot

ddr5 in ddr4 slot DDR4 is not compatible with any earlier type of random-access memory due to different signaling voltage and physical interface, besides other factors

ddr5 slot Memory is not compatible across all motherboards Generally speaking, motherboards are built to support only one type of memory So, you can't mix and match Is it possible to upgrade your older DDR4 laptop to use DDR5 memory? No DDR4 and DDR5 SODIMM memory sticks are not interchangeable