Specifications for the MSI Z790 motherboard series have been published recently. According to these shared documents, the motherboards will support the JEDEC DDR5-5600 specs by default. The MSI MEG Z790 can support up to 6800+ MT/s in 1 DIMM Per Channel. This is the 1-rank configuration. As for 2-rank memory, the speed will be 6400 MT/s. if we compare this with MSI’s Z690 premium MEG boards like the ACE, UNIFY, or GODLIKE, they support DDR5 memory of up to 6666 MT/s.
MSI has also planned Z790 motherboards which will support DDR4 memory and will have 5333 MT/s in a 1-rank configuration. The MSI Z690 DDR4 board is the fastest and can support up to 5200 MT/s.
The MSI X670E motherboards which have been listed on the official websites don’t list the memory specs hence we can’t say for sure whether the Z790 or X670E series will support faster memory. There is also a possibility that they might not differ at all. Biostar is the only one that lists memory specs. Even Gigabyte, ASUS, and ASRock don’t do so.