The Japanese government estimates the Earth Simulator cost $400,000,000, making it the most expensive computer ever built. By May 2002, the 640 processor node supercomputer was benchmarked with Linpack as having 35.86 TFlop/s performance. Each processor node in the Earth Simulator contains 8 vector processors running at 500MHz with 16GB of shared memory, and the total main memory in the machine is 10 terabytes. The operating system running on the supercomputer is NEC’s UNIX-based OS called“SUPER-UX” which is used on NEC’s SX Series of supercomputers