AMD's next generation of EPYC processors, currently referred to as "Genoa", are tipped to support 12-channel memory. Now, it is also slated to support 1TB of DDR5 RAM via each of these channels, for a grand total of 12TB. Then again, it may be capable of doing so under certain server-grade conditions only.
https://www.notebookcheck.net/One-Zen-4-based-AMD-EPYC-processor-could-support-up-to-12TB-of-DDR5-RAM-thanks-to-its-advanced-specs.584518.0.html