Memory Subsystem
The Octane supports 256 MB to 8 GB of system memory, using proprietary 200-pin DIMMs. There are two system board revisions. The first revision (part number 030-0887-003) supports 2 GB of RAM, while the second (part number 030-1467-001) allows up to 8 GB. The memory subsystem has vast reserves of bandwidth that can be directly served by the Xbow router to any XIO card.
The Octane's memory controller is aptly named HEART. It acts as a bridge between the processor, the memory (SDRAM) and the XIO bus.
Read more about this topic: SGI Octane
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