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Cray-4
The Cray-4 was intended to be Cray Computer Corporation's successor to the failed Cray-3 supercomputer. It was marketed to compete with the T90 from Cray Research.〔http://www.secinfo.com/dS9Jj.a1k.htm CCC 1995 8K and press release〕 CCC went bankrupt in 1995 before any Cray-4 had been delivered.
==Design==
The earlier Cray-3 was the first major application of gallium arsenide (GaAs) semiconductors in computing. It was not considered a success, and only one Cray-3 was delivered. Seymour Cray moved on to the Cray-4 design, announcing the design in 1994.
The Cray-4 was essentially a shrunk and sped-up version of the Cray-3, and it consisted of a number of vector processors attached to a fast memory. The Cray-3 supported from four to sixteen processors running at 474 MHz, while the Cray-4 scaled from four to sixty-four processors running at 1 GHz.〔(Cray develops Cray-4 (Apr 1994) ) Seems broken〕 The final packaging for the Cray-4 was intended to fit into , and was to be tested in the smaller one-CPU "tanks" from the Cray-3. A "midrange" system included 16 processors, 1,024 megawords (8192 MB) of memory and provided 32 gigaflops for $11 million.〔(NASDAQ 1995 filing )〕
The local memory architecture used on the Cray-2 and Cray-3 was dropped, returning to the mass of B- and T- registers on earlier designs, owing to Seymour's lack of success using the local memory effectively.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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