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In page Cray-4:

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The Cray-4 was essentially a shrunk and sped-up version of the Cray-3, consisting 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.[1] The final packaging for the Cray-4 was intended to fit into 1-cubic-foot (0.028 m3), 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.[2]