Dual-Inline Memory Modules (Dimms); Figure A-7 Memory Bank Layout - Silicon Graphics Origin 300 User Manual

A: Technical Specifications

Dual-inline Memory Modules (DIMMs)

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Each SGI Origin 300 base module has from 512 MB to 4 GB of local memory, which
includes main memory and directory memory for cache coherence.
Local memory can consist of two to four banks, which are referred to as banks 0, 1, 2, and
3. The four banks are arranged as two DIMM pairs; DIMM pair 0 and DIMM pair 1.
DIMM pair 0 consists of banks 0 and 1; DIMM pair 1 consists of banks 2 and 3. Each pair
of banks consists of two dual-inline memory modules (DIMMs) that contain double data
rate synchronous dynamic random-access memory (DDR SDRAM) chips.
Memory is increased or decreased in two-DIMM increments only. The two DIMMs that
make up a bank pair must be the same memory size; however, each pair of DIMMs can
be a different memory size. Figure A-7 shows the layout of the memory banks.
Processor Processor
B
VRM 5
VRM 4
Processor Processor
D
Figure A-7 Memory Bank Layout
The SGI Origin 300 base module supports the following memory kits:
• 512-MB kit with integrated directory memory.
• 1-GB kit with integrated directory memory.
• 2-GB kit with integrated directory memory.
A
Bedrock
DIMM Pair 1, Banks 2, 3
DIMM Pair 0, Banks 0, 1
DIMM Pair 1, Banks 2, 3
C
DIMM Pair 0, Banks 0, 1
VRM 2
Xbridge
VRM 3
VRM 1
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