In the zen2 architecture of AMD, amd went further in the original MCM multichip design, and changed to the small chip design of chips, which is simply to separate the CPU core and IO core, using different processes respectively, the former is TSMC 7Nm process, the latter is GF 14 / 12NM process.
So what are the benefits of this design? At the recent ISSCC conference, amd released some data and compared the cost data of 7Nm zen2 in different core configurations.
First of all, for the desktop version, if the sharp Dragon 3 with 16 core and 32 threads is taken as the 100% benchmark, the cost of 16 core processor with native core will exceed 2, at least twice the cost.
If it is epyc Xiaolong processor, the more the number of cores, the more obvious the cost advantage. If 64 core 7Nm sharp dragon is used as the benchmark, the cost of 48 core is 0.9, while the cost of original 48 core design is at least 1.9, still twice the level.
Of course, as the number of cores decreases, the cost-benefit will also decline. The cost of desktop 8-core is almost the same as that of the original core design,16 cores and above will lead to significant cost reduction。
The reason is also very simple. In the small chip design of AMD, IO core is produced by 14nm process. The cost of this part is relatively fixed and will not increase or decrease with the number of cores. Therefore, the less CPU core, the less cost advantage, and the more core, the more obvious.