Editing Cray-2 (section)

==Trivia==
Due to the use of liquid cooling, the Cray-2 was given the nickname "Bubbles", and common jokes around the computer made reference to this unique system.  Gags included "No Fishing" signs, cardboard depictions of the [[Loch Ness Monster]] rising out of the heat exchanger tank, plastic fish inside the exchanger, etc. The power consumption of the Cray-2 was 150–200&nbsp;kW.  Research conducted at the Lawrence Livermore National Laboratory in the early 1990s indicated that to a limited extent the perfluorinated polyether used to cool Cray-2 circuits would break down to form the extremely toxic gas [[perfluoroisobutylene]].<ref>Kwan, J. Kelly, R, Miller G. Presentation at the American Industrial Hygiene Conference, Salt Lake City, UT, May 1991</ref> At the time, Cray had created a poster showing the transparent "bubble chamber" that the cooling fluid was run through for visual effect, with a spill of the same material glistening on the floor—the joke was that if this actually occurred, the facility would have to be evacuated.<ref>Kelly, R. J.,  Personal Experience{{reliable source|date=October 2020}}</ref> The manufacturer of the liquid developed a scrubber that could be placed in line with the pump that would catalytically degrade this toxic breakdown product. 

Each vertical stack of logic modules sat above a stack of power modules which powered 5 volt [[busbar]]s, each of which delivered about 2200 amps.  The Cray-2 was powered by two motor-generators, which took in 480 V [[Three-phase electric power|three-phase]].