Origin 3000 Memory
All models based on the Origin 3000 architecture use Double Data Rate (DDR) synchronous dynamic random-access memory (SDRAM), at the lowest level organized into banks of two DIMMs each - memory may only be added or removed from the system in pairs of two DIMMs. Both DIMMs within a bank must be of the same density, however two different banks may hold different density DIMMs from each other.
SGI produced DIMMs with capacities of 256MB to 1GB, using DRAM chips with densities of either 128 Mbits or 256 Mbits. All DIMMs include directory memory to support cache coherence between local and remote memory, but some parts include "premium" directory memory which is recommended for configurations with more than 128 processors. Memory was generally marketed in kits of two DIMMs, where the capacity of the kit would be given as 512MB, 1GB, or 2GB.
The following table shows the part numbers for individual DIMMs according to their capacity.
|Capacity||Standard Directory||Premium Directory||Notes|
|512 MB|| 030-1044-00x, 030-1746-00x,
| 030-1041-00x, 030-1042-00x,
DATARAM 63673 ?
|1 GB|| 030-1850-00x,
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