Hi [NAME]  thank you for sharing update.  Having purchased RAM cards that run at 2667 MHz, BIOS will acknowledge the new RAM cards and run them at their rated compatibility speed. Please contact OEM and ask them to check the compatibility of your purchased RAM cards. Most OEMs will exchange the RAM cards so they are compatible with your system speed of 3200 MHz.  Amd ryzen 7 5800x RAM speed - CPUs, Motherboards, and Memory - Linus Tech Tips  says 3600 MHz XMP profile should work.  Please note Alienware m15 Ryzen Edition R5 has a new variable to tweak, AMD Infinity Fabric allows different chip components to be overclocked separately. Normally the fabric clock is tied to RAM speed, eg 3200MHz RAM running with a fabric clock of 1600MHz, but this only holds true up to 3600MHz. The RAM card OEM will tell you how fast the XMP profile will run. 
Hi I can't find the Bios Performance menu to change the ram clock speed to 3200 and can't activate XMP profile because its not intel. How can I get get 3rd party Crucial ram to have the right clock speed? Anyone can help me?
m15 R5, XMP profile unavailable since its not Intel I guess