Ultra Start 450 SERIES Instruction Manual download pdf (Page 71)

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Chapter 4 Hardware Configuration 51

About Memory

The system’s main logic board provides sixteen slots for high-capacity dual inline

memory modules (DIMMs). The system supports Sun standard 144-pin, 5-volt,

60-nanosecond memory modules. Modules of 16-, 32-, 64-, 128-, and 256-Mbyte

capacities can be installed in the system. Total system memory capacity ranges from

64 Mbytes to 4 Gbytes.

Memory slots are organized into four banks, with each bank comprising four slots.

The system reads from, or writes to, all four DIMMs in a bank at the same time.

DIMMs, therefore, must be added four at a time in the same bank. The following

figure shows the memory banks on the main logic board.

Whenever banks A and B are populated with identical capacity DIMMs, memory

reads and writes are automatically interleaved between the two banks. This is called

two-way interleaving. Two-way interleaving significantly reduces the average memory

latency, thus improving overall system performance. Two-way interleaving also

occurs automatically when banks C and D are populated with identical capacity

DIMMs. When all four banks contain identical capacity DIMMs, the system

interleaves across all four banks (called four-way interleaving), to further reduce

average memory latency.

By default, memory interleaving only occurs when identical capacity DIMMs are

installed. However, it is possible to configure the system to perform memory

interleaving even when DIMMs of different sizes are used. In this case, however,

some of the memory capacity will remain unused. For more information, please refer

Memory banks

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Ultra Start 450 SERIES Instruction Manual Page 71

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