Ultra Start 450 SERIES Instruction Manual download pdf (Page 72)

52 Ultra Enterprise 450 Server Owner’s Guide • July 1997

to Platform Notes: Sun Ultra 450 Workstation and Ultra Enterprise 450 Server, available

on the Solaris on Sun Hardware AnswerBook. This AnswerBook documentation is

provided on the SMCC Updates CD for the Solaris release you are running.

Note – In some cases, Platform Notes: Sun Ultra 450 Workstation and Ultra

Enterprise 450 Server may be included with your system documentation instead of on

the Solaris on Sun Hardware AnswerBook.

Configuration Rules

Memory DIMMs must be added four at a time within the same bank, and each bank

used should have four identical capacity DIMMs installed (for example, four

32-Mbyte DIMMs, or four 64-Mbyte DIMMs).

The main logic board must have at least one bank filled or the system will not boot.

You must fill the banks in the following order: A, B, C, D.

Two-way interleaving occurs automatically whenever identical capacity DIMMs are

installed in banks A and B or in banks C and D. Four-way interleaving occurs

automatically whenever all four banks are filled with identical capacity DIMMs.

Interleaving is disabled when only one or three banks are occupied. Therefore, it is

recommended that when adding additional memory to the system you increase from

one bank to two, or from two banks to four. While the system will operate with three

banks filled, the performance gains from adding memory in the third bank will be

partially offset by the loss of memory interleaving.

The system will operate with memory DIMMs of different capacities in different

banks (for example four 32-Mbyte DIMMs in bank A and four 64-Mbyte DIMMs in

bank B), but for improved performance, populate banks A and B with DIMMs of

identical capacity, and populate banks C and D with DIMMs of identical capacity.

Installing additional memory will almost always improve system performance,

however adding DIMMs of equal capacities to those already installed will provide

the best performance gains.

Bank Sockets

A (Required) U1901 through U1904

B U1801 through U1804

C U1701 through U1704

D U1601 through U1604

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Ultra Start 450 SERIES Instruction Manual Page 72