The modules use Intel's new Multiplexer Combined Ranks (MCR) technology which allows for running two ranks simultaneously utilising the server buffer area.
So, the chips don't run at faster speeds, but the MCR helps the entire module run twice as fast, shifting 128B of data instead of 64 -- doubling the memory bandwidth and moving more data.
SK hynix says that the two techs combined equate to 8Gbps or 8000MT/s of data transfer speed faster than most consumer DDR5 DRAM modules.
SK hynix has been developing high-capacity memory including some 48GB and 96GB RDIMM modules late last year but it has been outclassed so far by Samsung which claims to have capacities of 512GB and, 768GB, modules for servers, and high-performance computing (HPC) workloads.
Nonetheless, Hynix can still pat itself on the back for being the first to the market with DDR5.