Through the use of AMD EXPO
Ryzen Threadripper 7000 processors, according to AMD's website, support memory up to an effective frequency of 5200 MHz. In reality, of course, faster memory is supported. Judging by Gigabyte, the TRX50 AERO D motherboard for the new AMD CPUs supports memory with frequencies up to 7800 MHz!
G.Skill and V-Color are already preparing 32 and 64 GB kits with DDR5-6000 and DDR5-6400 memory, and AMD EXPO profiles allow you to increase it to DDR5-7200. Later there will be faster memory that can be overclocked to 7800 MHz. In particular, it is already known that V-Color kits with article numbers TRA524G78S838R3 and TRA516G78S838 will offer frequencies out of the box of 4800 and 5600 MHz, respectively, while it can be increased to those same 7800 MHz.
It is still unclear how much this will affect performance in certain applications. The tests we've seen previously for the Threadripper 7000 were done using DDR5-6400 or slower memory.