When carefully picking out parts for your PC build, you’ll notice that your RAM was marketed with AMD EXPO and Intel XMP as one of the significant features. DDR5 will have one or possibly both of these mentioned, while DDR4 will have XMP or say they’re compatible with AMD’s Ryzen platform, but whatever the naming scheme, they all behave similarly. They’re profiles for frequency, timings, and voltage that the RAM kit will use in the BIOS to try and boot with the best performance, but there’s a catch.