ddr4 and ddr5 same slot - Mainboard MSI C236M WORKSTATION tt slot 888

DDR5 slots are not backward compatible with DDR4. CPU Support: Compatible with the latest Intel 12th Gen (Alder Lake) and later processors, as well as AMD Ryzen ...

DDR5 graphics cards require a PCIe 5.0 slot, which is not available on most DDR4 motherboards that typically have PCIe 3.0 or 4.0 slots.

Although DDR5 retains the 288 pins from DDR4 (albeit with different pinout configurations), the notch (called a key) has been shifted to the left – making DDR4 and DDR5 modules physically incompatible.