G.SKILL's new Trident Z5 DDR5-RAM for gamers offers frequencies of up to 6400MHz, low CL timings and supposedly has enough headroom for further overclocking.
https://www.notebookcheck.net/G-SKILL-reveals-its-new-high-end-Trident-Z5-DDR5-memory-with-frequencies-of-up-to-6400MHz.572265.0.html