You have DDR4 3600 MHz RAM but only display 2400 MHz.
You have DDR4 3600 MHz RAM but only display 2400 MHz.
I bought a 16GB RAM package (two 8GB units) paired with an MSI B450 Mortar Max. When I power on the system, it displays 2400MHz instead of the expected 3600MHz.
This configuration suggests a mixed setup with a Jedec at 2400 MHz and an XMP at 3600 MHz. Yes, that's a common mix-matched arrangement.
It seems multiple entries are present here. The first row lists SPD and XMP, taken from Mortar Max's memory QVL. The OP is planning a "Team group excalibur 16gb (2x8gb) 3600mhz" setup and suggests enabling the XMP profile in the BIOS to achieve the desired result.
I retrieved a random set from the catalog. It seems to be a QVL list.