And about the Ocean Light system
Chinese supercomputer Tianhe Xingyi, also called Tianhe-3, seems to really be the most powerful in the world.
According to recent data, the performance of this system is 1.57 ExaFLOPS with a peak of 2 ExaFLOPS. By comparison, Frontier, which tops the Top500, has 1.19 and 1.7 ExaFLOPS, respectively. Moreover, another Chinese supercomputer — Ocean Light — is the second most powerful in the world and is also ahead of Frontier, with a performance of 1.22 ExaFLOPS. At the same time, China does not transfer its data to the authors of the Top500 and does not particularly advertise the characteristics of its supercomputers, so formally these two systems seem to not exist.
Even more impressively, Tianhe Xingyi is based on Chinese-designed FeiTeng MT3000 processors, which are based on Arm architecture.
MT3000 has 16 general purpose cores, 96 control cores and an accelerator with 1536 cores.
True, such CPUs are probably produced at SMIC facilities, which means that they are 7-nanometer at best, but, more likely, the process technology here is either 10 nm or 14 nm, which means that The energy efficiency of a Chinese supercomputer must be quite low.