Digital Equipment PRIORIS ZX 5000 MP, User Manual

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Expanding Your Server
3-18
Installing Additional Server Memory
Adding more memory to the existing memory module or installing an addi-
tional memory module enables your server to run larger, more complicated
software and run it quicker.
Each memory module contains three sets of memory banks (banks 1
through 3). Each bank consists of four SIMM sockets. Your server comes
with at least
32 MB of memory installed in bank 1. When adding additional memory
make sure you:
•
Install 36-bit SIMMs having an access time of 80 ns or less.
•
Fill one bank (four sockets) at a time using the same SIMM size,
type, and speed (8 MB, 16 MB, and 32 MB densities are available).
CAUTION:
Mixing dissimilar metals might cause SIMM
failure. Install SIMMs with tin-lead alloy plated edge connec-
tors only in tin-lead alloy plated sockets. Install SIMMs with
gold-lead alloy plated edge connectors only in gold-lead
alloy plated sockets.
•
Fill bank 1 before bank 2 and banks 1 and 2 before bank 3.
Refer to “Memory Configurations” for a list of SIMM combinations supported
by your Prioris ZX 5000 MP Series Servers and to “Installing a SIMM” for de-
tailed instructions on installing SIMMs.
In addition, the physical memory addresses shift depending on the SIMM
size and the number of sockets filled on the ECC memory module. Start-
ing with bank 1, address 0 is always in the last row of SIMM-filled sockets;
for example:
•
If you install SIMMs in only sockets 1-4, then memory address 0 is
in sockets 3 and 4 of bank 1.
•
If you install SIMMs in sockets 1-8, then memory address 0 shifts
to sockets 7 and 8 of bank 2.
•
If you install SIMMs in sockets 1-12, then memory address 0 shifts
to sockets 11 and 12 of bank 3.