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Among these was the use of liquid nitrogen for cooling the CMOS-based CPUs. The ETA10 successfully met the company's initial goals (10 GFLOPS), with some models achieving a cycle time of about 7 ns (143 MHz) - considered rapid by mid-1980s standards. They delivered seven liquid nitrogen-cooled versions and 27 smaller, air-cooled versions.
Because the liquid-to-gas expansion ratio of nitrogen is 1:694 at 20 °C (68 °F), a tremendous amount of force can be generated if liquid nitrogen is vaporized in an enclosed space. In an incident on January 12, 2006 at Texas A&M University , the pressure-relief devices of a tank of liquid nitrogen were malfunctioning and later sealed.
Nevertheless, the product was one of the fastest computers on the market, and 7 liquid nitrogen-cooled and 27 smaller air cooled versions of the computers were sold during the next few years. They used the new CMOS chips, which produced much less heat.
The partnership will also focus on creating liquid-cooled systems for high-performance computing (HPC), generative AI, and next-generation green data centers. Fujitsu and Supermicr
A Cray-2 and its Fluorinert-cooling "waterfall", formerly serial number 2101, the only 8-processor system ever made, for NERSC A Cray-2 operated by NASA Front view of 1985 Supercomputer Cray-2, Musée des Arts et Métiers, Paris Side view of 1985 Supercomputer Cray-2, Musée des Arts et Métiers, Paris Detail of the upper part of the Cray-2 Inside of the Cray-2
In a typical installation of liquid nitrogen cooling, a copper or aluminium pipe is mounted on top of the processor or graphics card. After the system has been heavily insulated against condensation, the liquid nitrogen is poured into the pipe, resulting in temperatures well below −100 °C (−148 °F).
Contemporary cryogenic processors monitor temperature fluctuations and modulate the liquid nitrogen input to ensure that only fractional changes in temperature occur over a specific period of time. These temperature readings and adjustments are synthesized into profiles that are used to repeat the process when treating similarly grouped objects.
The research program was first termed to be: "Direct use of waste heat from liquid-cooled supercomputers: the path to energy saving, emission-high performance computers and data centers." The waste heat produced by the cooling system is able to be recycled back in the building's heating system, potentially saving money.
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