Multi-Chip-Module (Epyc) is just 4 separate dies wired together. (As Intel would derisively point out if is basically 4 Ryzen desktop chips glued together). Th

Multi-Chip-Module (Epyc) is just 4 separate dies wired together. (As Intel would derisively point out if is basically 4 Ryzen desktop chips glued together). The advantage of this architecture is that smaller chips are easier to manufacture because the probability of a random defect rendering the chip useless is lower and when a chip is bad it is not as great of a loss. Epyc chips run all existing software. There is extra work involved with Non-Uniform Memory Access (NUMA) where if you want software to actually use 32 or 64 cores simultaneously it has to be purposefully designed to take into account the architecture but that is not really any different than developing for multi-processor systems in the past. The point is that we have hit the ceiling on frequency scaling, which means more cores, and now we have hit the ceiling on core count scaling, so now it is going to be more CPUs, and the best way to do more CPUs is with MCMs.