https://wccftech.com/msis-latest-z690-b660-motherboard-bios-improves-intel-alder-lake-non-k-memory-compatibility/

MSI has released a new BETA BIOS for its Z690 and B660 motherboards which improve memory compatibility for Intel's Alder Lake Non-K CPUs.

One of the main selling points of the B660 platform is that it supports XMP 3.0 technology while being more affordable than the Z690 motherboard options. Technically speaking, XMP 3.0 isn't memory overclocking but allows users to run their memory modules at the rated specs by DIMM manufacturers rather than the JEDEC specs. This allows faster performance than the non-XMP platforms such as H610 which will be running at JEDEC specs of DDR4-3200 or DDR5-4800. Intel's Non-K Alder Lake CPUs also don't feature fully-unlocked memory overclocking due to a locked VCCSA (CPU SA Voltage). This means that most users won't be able to run DDR4-3600 at Gear 1 mode.