A recent entry in SiSoftware's SANDRA database lists AMD's upcoming "Rome" EPYC CPU with double the L3 cache as prior Zen CPUs. Detailed as "16 x 16 MB L3," this would put total L3 cache for Rome at 256 MB across its 64 cores, utterly trouncing Intel's forthcoming Cascade Lake CPUs. However, this is still a rumor and should be treated as such.
https://www.notebookcheck.net/AMD-s-Zen-2-Rome-EPYC-CPUs-may-double-L3-cache-per-CCX-for-a-total-of-256-MB.369351.0.html