big.LITTLE by AMD: Zen 4c has the same IPC as the big Zen 4 - HWCooling.net
AMD Zen 2 CPU Rumors: 16 Cores Ryzen, 32 Core Threadripper, 64 Core EPYC
AMD Ryzen 4000 Zen 3 will be compatible with Socket AM4, but it is end of the road for X470, B450, and below motherboard owners - NotebookCheck.net News
AMD Zen 3 CPU Architecture Rumored To Provide Significant IPC Uplift Over Zen 2 | HotHardware