The Cray C90 series (initially named the Y-MP C90) was a vector processor

supercomputer A supercomputer is a computer with a high level of performance as compared to a general-purpose computer. The performance of a supercomputer is commonly measured in floating-point operations per second ( FLOPS) instead of million instructions ...

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 clock cycle (244 MHz), 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 UNICOS is a range of Unix and after it Linux operating system (OS) variants developed by Cray for its supercomputers. UNICOS is the successor of the Cray Operating System (COS). It provides network clustering and source code compatibility la ...

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 Dynamic random-access memory (dynamic RAM or DRAM) is a type of random-access semiconductor memory that stores each bit of data in a memory cell, usually consisting of a tiny capacitor and a transistor, both typically based on metal-oxid ...

memory, allowing increased maximum memory sizes of up to 16 GB, depending on the model. The successor system was the Cray T90. Computer Museum of America (27)

External links

Cray Research and Cray computers FAQ Part 5

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