No, DDR5 Z690 motherboards aren't reverse-compatible with DDR4 RAM.
No, DDR5 Z690 motherboards aren't reverse-compatible with DDR4 RAM.
For DDR4 systems, ensure you have a compatible DDR4 motherboard.
Voltage levels and pin configurations differ between DDR4 and DDR5 modules. Although the pin count matches that of DDR4, the wiring is altered, making them incompatible. To avoid issues, the key notch in the module has been adjusted slightly, preventing a direct fit between DDR4 and DDR5 slots.