Do not mix memory kits. Memory kits are sold in matched kits that are designed to run together as a set. Mixing memory kits will result in stability issues or system failure.
Memory kits that are "Intel XMP 3.0 Ready" only includes XMP, and memory kits that are "AMD EXPO Profile Ready" only includes EXPO.
Prior to enabling XMP or EXPO, memory kits will boot at default BIOS settings with compatible hardware.