Intel Z790 motherboards support DDR5-6800 memory.
Here are some initial details regarding Intel Z790 memory support.
We have received documents for the upcoming MSI Z790 series motherboards including their specifications. The documentation confirms that these motherboards will support the JEDEC DDR5-5600 specification by default (for Alder Lake it was 4800 Mbps).
The MSI MEG Z790 series supports up to 6800+ million jumps/sec in 1 DIMM per channel (1DPC) and single drive configuration. For dual-tier memory, this speed will drop to 6400 MB/s. For comparison, MEG Z690 Premium cards from MSI such as GODLIKE, ACE or UNIFY support DDR5 memory up to 6666 million megabytes/sec , while the high-end chip (MPG) has up to 6,400 million megabytes/sec.
MSI Z790 motherboard with DDR5 memory, Source: VideoCardz
Z790 motherboards will also be available with DDR4 memory supporting speeds of up to 5333 MT/s in 1DPC and 1R configurations. The fastest MSI Z690 DDR4 motherboard supports up to 5200 MT/s memory.
MSI Z790 motherboard with DDR4 memory, Source: VideoCardz
Interestingly, none of the MSI X670E motherboards listed on official websites have memory specs. Therefore, it cannot be accurately determined whether Z790 or X670E series supports faster memory, or maybe there is no difference.
In fact, neither ASUS nor Gigabyte nor ASRock list the memory specs, But Biostar does it (Thanks to dudulab for letting us know). According to the X670E Valkyrie specification, it supports overclocked DDR5-6000 memory.
AMD has yet to reveal details regarding its EXPO technology for DDR5 memory overclocking profiles. This information has yet to be shared by any board partners or even AMD itself.
