The ES is a highly parallel vector supercomputer system of the distributed-memory type, and consisted of 640 processor nodes (PNs) connected by 640x640 single-stage crossbar switches. Each PN is a system with a shared memory, consisting of 8 vector-type arithmetic processors (APs), a 16-GB main memory system (MS), a remote access control unit (RCU), and an I/O processor. The peak performance of each AP is 8Gflops. The ES as a whole thus consists of 5120 APs with 10 TB of main memory and the theoretical performance of 40Tflops

Peak performance/AP	8Gflops	Total number of APs	5120
Peak performance/PN	64Gflops	Total number of PNs	640
Shared memory/PN	16GB	Total peak performance	40Tflops
		Total main memory	10TB