The c variants of zen are for cloud and are more compact variants of the full zen 5 cores, they generally want as many cores in as compact a format as possible.

We might see 5c show up in SoCs (like the chip in a hypothetical steam deck 2) as well because they want their chips to be as small as possible so they can price their devices as competitively as possible. I don’t think we will see those go up to 32 cores however as there is indeed no need for that many cores on consumer chips.

Not quite an e-core but the goal is the same: Make more efficient use of the available die space by packing in more, slower cores.

The difference is that Intel’s e-cores achieve this by having a different architecture and support less features than their p-cores. E-cores for example do not support multi threading. E-cores are about 1/4 the size of a o-core.

AMD’s 4c cores support the same features and have the same IPC as full zen 4 cores but operate at a lower clock speed. This reduces thermal output of the core, allowing them to pack in the circuitry much more densely.

Undoubtedly Intel’s e-cores take advantage of this effect as well and they are in fact quite a bit smaller than 4c: a 4c core is about 1/2 the size of a zen 4 core. The advantage of AMD’s approach is that having the cores be the same simplifies the software side of things.

Threadripper 7000 went up to 64 cores with 8 dies (excluding IO die) , so 8 cores per die.