Cray Computer Corporation, United States

Seymour Cray chose exotic gallium arsenide (GaAs), instead of silicon, for the circuitry of the Cray-3. The modules in this “brick” comprise a multi-layer sandwich of printed circuit boards that contain 69 electrical layers and four layers of GaAs circuitry. It consumed 90,000 watts of power and, like the Cray-2, was cooled by immersion in Fluorinert. Only one complete Cray-3 was built. A computation that took the Cray-3 only one second would have taken ENIAC 67 years.

Memory Type: Semi Speed: 15 GFLOPS

Memory Size: 2G Cost: $30,000,000

Memory Width: (64-bit)