PEZY-SC4S: A New High-Efficiency FP64 Processor from Japan

PEZY Computing, a Japanese supercomputing company, unveiled its latest architecture, PEZY-SC4S, at Hot Chips 2025. This processor focuses on high-efficiency FP64 computation, utilizing a massively parallel array of execution units running at lower clocks and voltages than contemporary GPUs. PEZY-SC4S features a multi-level cache system to balance capacity and speed, and employs small vectors to reduce throughput losses from branch divergence. Its programming model is similar to OpenCL, making it user-friendly. Compared to its predecessor, PEZY-SC4S boasts significant efficiency improvements, with projected power consumption below 300W and achieving ~91 Gigaflops per Watt. Targeted at applications demanding high-precision computation, such as simulations, the processor highlights Japan's continued investment in independent supercomputing chip development.