SGI Origin 300

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The SGI Origin300 was released October 9, 2001 as a mid-range server for technical computing and media applications. An Origin300 compute node consists of a 2U-high system that contains 2 or 4 64-bit MIPS microprocessors and up to 4GB of local memory.

A Single-System Image Origin300 consists of up to 8 compute node "bricks" with 32 processors and 32GB of shared memory in a single rack using cache-coherent NUMA technology.

System Architecture

The Origin300 uses an IP45 mainboard housing the following components:

  • 2 or 4 MIPS Microprocessors (with independant secondary cache)
  • Four Dual inline memory module (DIMM) slots organized in banks of two
  • The Xbridge ASIC that interfaces between the Bedrock ASIC and PCI slots
  • The Bedrock hub carrying traffic between the processors, memory and I/O devices
  • EEPROM containing the system's Serial ID
  • L1 Controller
  • Five Voltage Regulation Modules
  • Two NUMALink 3 LEDs and Four hearbeat LEDs

Processors overview

The Origin300 was available with 2 or 4 64-bit R14000 processors per compute node in either 500MHz or 600MHz clock speeds.

Memory subsystem

Each Origin300 compute node has from 512MB to 4GB of local memory, including both main memory and directory memory for cache coherence.

Local memory consists of two or four banks that are referred to as banks 0, 1, 2 and 3. The four banks are arranged as two DIMM pairs (0 and 1). Each pair of banks consists of two dual-inline memory modules (DIMMs) that contain double data rate synchronous dynamic random-access memory (DDR SDRAM).

Memory may be added or removed from the system in two DIMM increments only. Both DIMMs in any bank must be of the same density, however two banks may hold different density DIMMs.

SGI offered three memory kits for the Origin300:

  • 512 MB kit with integrated directory memory
  • 1 GB kit with integrated directory memory
  • 2 GB kit with integrated directory memory