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Codenamed "Tollhouse," the '''Altix 4000''' series was Silicon Graphics' second and last Itanium-based product family. It was composed of two models: the Altix 450, a mid-range server generally limited to no more than a single full-sized rack; and the Altix 4700, a high-end system for the High Performance Computing and data-intensive workload markets.
 
Codenamed "Tollhouse," the '''Altix 4000''' series was Silicon Graphics' second and last Itanium-based product family. It was composed of two models: the Altix 450, a mid-range server generally limited to no more than a single full-sized rack; and the Altix 4700, a high-end system for the High Performance Computing and data-intensive workload markets.
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The '''Altix 4000''' family used a different approach to packaging components. Whereas the [[SGI Origin 3000]] and '''Altix 3000''' used "bricks" of 2U/3U compute packages, the '''Altix 4000''' would be built up from blade-based [[Individual Rack Unit]]s or IRUs. Each IRU can be configured with a number of "blades," where each blade can offer CPU, memory, I/O expansion, or new FPGA-based [[Reconfigurable Application Specific Computing]] ([[RASC]]) resources. Each IRU incorporates two [[NUMAlink|NUMAlink 4]] routers to handle interconnecting multiple IRUs into a larger configuration.
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The '''Altix 4000''' family used a different approach to packaging components. Whereas the [[SGI Origin 3000]] and '''Altix 3000''' used "bricks" of 2U/3U compute packages, the '''Altix 4000''' would be built up from blade-based [[Individual Rack Unit]]s or IRUs. Each IRU can be configured with a number of "blades," where each blade can offer CPU, memory, I/O expansion, or new FPGA-based [[Reconfigurable Application Specific Computing]] (RASC) resources. Each IRU incorporates two [[NUMAlink|NUMAlink 4]] routers to handle interconnecting multiple IRUs into a larger configuration.
    
Operating system choices included RedHat Enterprise Linux Advanced Server and SuSE Linux Enterprise Server, with SGI's [[ProPack]] adding various tools and management utilities.
 
Operating system choices included RedHat Enterprise Linux Advanced Server and SuSE Linux Enterprise Server, with SGI's [[ProPack]] adding various tools and management utilities.

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