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The first supercomputer produced by Cray Research, Inc. Designed by Seymour Cray. Became available in 1976.

Well known for its horseshoe-shaped design which reduced the length of wiring between computing modules. Seymour went so far as to hire an expert in the field of air conditioning and refrigeration to design the liquid freon system which kept the Cray-1 cool.

The Cray-1 featured a memory size of 8 megabytes, and implemented vector processing instructions to speed up floating point calculation. The Cray-1 had a peak crunching rate of 133 megaflops.