IT Home reported on December 23 that AMD recently released R5 8540U and R3 8440U two mobile processors, confirming that this series of processors uses Zen4 + Zen4c hybrid architecture, but AMD did not announce the new Zen4c "small core" base frequency / acceleration frequency and other information.
According to Tom's Hardware, the processor parameters page on AMD's official website will be updated to show more parameters of the Zen4c "small core".
According to a previous report by IT House, the R5 8540U is 2 Zen4 cores + 4 Zen4c cores, and the R3 8440U is 1 Zen4 core + 3 Zen4c cores. The cores of this series of hybrid architecture processors are all 4CU. In addition, it is reported that AMD will also launch an R5 8500G desktop APU early next year, which is also expected to use the specifications of 2 Zen4 + 4 Zen4c + 4CU core graphics.
Intel's large and small core architecture processors have been launched for several generations, and its official website can find clear frequency information for large and small cores. The i7-14700K pictured below has a large core frequency of 3.4GHz to 5.6GHz and a small core frequency of 2.5GHz to 4.3GHz.
AMD's Zen4 and Zen4 hybrid architectures differ from Intel's large and small core architectures. The AMD Zen 4c architecture is an optimized version of the Zen 4 microarchitecture, first seen in the AMD EPYC 9704 Bergamo and EPYC 8004 Siena data center processors. Zen 4c retains the features of Zen 4, including the same instruction set, IPC, cache structure, etc. The Zen 4 core area is 3.84 square millimeters. In comparison, the Zen 4c core panel is only 2.48 square millimeters, which is 35% less.
According to AMD's official PPT, the various metrics of AMD Zen 4c and Zen 4 are basically the same, with the difference being that Zen 4 cores have 4MB of L3 cache per core, while Zen 4c has 2MB.
AMD data shows that Zen 4c has the exact same IPC (performance at a given frequency) as Zen 4.