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The Y-MP could be equipped with two, four or eight Vector Processor s, with two functional units each and a clock cycle time of 6 ns (167 MHz). Peak performance was thus 333 Megaflops per processor. Main memory comprised 128, 256 or 512 MB of SRAM . Center for Computational Sciences, GSFC ]] The original Y-MP (otherwise known as the Y-MP Model D) was housed in a similar chassis to the horseshoe-shaped X-MP, but with an extra rectangular cabinet added in the middle (containing the CPU boards), thus forming a "Y" shape in plan view. The system could be configured with one or two ''Model D'' IOSs (Input/Output Subsystems) and an optional Solid State Disk (SSD) of 256 MB to 4GB capacity. The Model D Y-MP was superseded in 1990 by the Y-MP Model E, which replaced IOS Model D with IOS ''Model E'', providing twice the I/O throughput. The Y-shaped chassis was dropped in favor of one or two rectangular cabinets (each with a separate connected cabinet containing the liquid cooling system), depending on configuration. Maximum RAM was increased to 2 GB and up to eight IOSs were possible. Model E variants included the '''Y-MP 2E''', '''Y-MP 4E''', '''Y-MP 8E''' and '''Y-MP 8I''', the latter being a single-cabinet (''I'' for ''Integrated'') version of the two-cabinet 8E. The 2E and 4E were later available with optional secondary air cooling. The Y-MP M90 was a large-memory variant of the Y-MP Model E introduced in 1992. This replaced the SRAM of the Y-MP with up to 32 GB of slower, but physically smaller DRAM devices. The Y-MP M90 was also available in variants with up to two, four or eight processors ('''M92''', '''M94''' and '''M98''' respectively). Later, the model name was abbreviated to the Cray '''M90''' series. Also in 1992, Cray launched the cheaper Y-MP EL (''Entry Level''). This was a reimplementation of the Y-MP architecture in CMOS technology, based on the S-2 design acquired by Cray from SuperTek in 1990. The EL was an air-cooled system with a completely different VMEbus -based IOS. EL configurations with up to four processors (each with a peak performance of 133 megaflops) and 32 MB to 1GB of DRAM were available. The Y-MP EL was later developed into the Cray ''' EL90 ''' series ('''EL92''', '''EL94''' and '''EL98'''). The Y-MP C90 series is described separately. EXTERNAL LINKS
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