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:''For the ANSI C90 programming language specification, see C programming language.''
The 'Cray C90' series (initially named the 'Y-MP C90') was a vector processor supercomputer launched by Cray Research in 1991. The C90 was a development of the Cray Y-MP architecture. Compared to the Y-MP, the C90 processor had a dual vector pipeline and a faster (4.1 ns or 244 MHz) clock speed, which together gave three times the performance of the Y-MP processor. The maximum number of processors in a system was also doubled from eight to 16. The C90 series used the same Model E IOS (Input/Output Subsystem) and UNICOS operating system as the earlier Y-MP Model E.
The C90 series included the 'C94', 'C98' and 'C916' models (configurations with a maximum of four, eight, and 16 processor respectively) and the 'C92A' and 'C94A' (air-cooled models). Maximum SRAM memory was between 1 and 8 GB, depending on model.
The 'D92', 'D92A', 'D94' and 'D98' (also known as the 'C92D', 'C92AD', 'C94D' and 'C98D' respectively) variants were equipped with slower, but higher-density DRAM memory, allowing increased maximum memory sizes of up to 16 GB, depending on the model.
The successor system was the Cray T90.

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★ Top500 description of the C90 architecture