They still use this today, and the ring interconnect is also the topology inside zen3/zen4 CCXs (with 8 cores). Ring is one of the simplest and best systems for >4 cores, until you get to about 8-10 cores (at which point you generally split it into multiple “tiers” like multiple CCXs etc).

Intel switched to a mesh model: https://en.wikichip.org/wiki/intel/mesh_interconnect_archite...

not for consumer chips, which still use the same ringbus design.

e-cores do have a CCX/core cluster, but the clusters themselves go on the ringbus lol