IBM 8681 Hardware Maintenance Manual - Page 72

See Using the Configuration/Setup, Cache-line interleaving

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Notes 1. You can install an optional memory board that contains an additional 16 DIMM connectors and supports cache-line interleaving. To obtain an optional memory board, contact an IBM reseller or IBM marketing representative. 2. The connector identifiers on both the standard and the optional memory boards are J1-J16. To distinguish the two memory boards, use the labels provided on the processor housing assembly. These labels refer to the connector identifiers as A1-A16 on the standard memory board (A), and B1-B16 on the optional memory board (B). 3. The server comes with a system label on the server cover. The numbers located to the right of the memory boards on the system label do not indicate DIMM connector identifiers. These numbers indicate the DIMMs; for example, 1 means the first DIMM that you install, 9 means the ninth DIMM that you install, and so on. 4. Cache-line interleaving can only occur if two memory boards are installed in the server. This process allows the two memory boards to share a common address range, with one memory board responding to even-numbered cache lines, and the other memory board responding to odd-numbered cache lines. This configuration has the highest performance because it allows the two SDRAM arrays to be used in a balanced fashion, reducing access conflicts. 5. Installing or removing DIMMs changes the server configuration. Therefore, after installing or removing a DIMM, save the new configuration information in the Configuration/Setup utility program. See "Using the Configuration/Setup Utility main menu" on page 21 for more information. 6. If you replaced a defective DIMM, you must manually enable the DIMM slot in the Configuration/Setup utility program. In this case, the system does not automatically access the Configuration/Setup utility program to enable the DIMM slot. See "Memory settings" on page 31 for additional information. 7. See "Memory board component locations" on page 130 for a layout of the memory board. 64 Netfinity Server HMM

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Notes
1.
You can install an optional memory board that
contains an additional 16 DIMM connectors and
supports cache-line interleaving.
To obtain an
optional memory board, contact an IBM reseller
or IBM marketing representative.
2.
The connector identifiers on both the standard
and the optional memory boards are J1–J16.
To
distinguish the two memory boards, use the
labels provided on the processor housing
assembly.
These labels refer to the connector
identifiers as A1–A16 on the standard memory
board (A), and B1–B16 on the optional memory
board (B).
3.
The server comes with a system label on the
server cover.
The numbers located to the right of
the memory boards on the system label do not
indicate DIMM connector identifiers.
These
numbers indicate the DIMMs; for example,
±1²
means the first DIMM that you install,
±9²
means
the ninth DIMM that you install, and so on.
4.
Cache-line interleaving
can only occur if two
memory boards are installed in the server.
This
process allows the two memory boards to share
a common address range, with one memory
board responding to even-numbered cache lines,
and the other memory board responding to
odd-numbered cache lines.
This configuration
has the highest performance because it allows
the two SDRAM arrays to be used in a balanced
fashion, reducing access conflicts.
5.
Installing or removing DIMMs changes the server
configuration.
Therefore, after installing or
removing a DIMM, save the new configuration
information in the Configuration/Setup utility
program.
See “Using the Configuration/Setup
Utility main menu” on page
21 for more
information.
6.
If you replaced a defective DIMM, you must
manually enable the DIMM slot in the
Configuration/Setup utility program.
In this case,
the system does not automatically access the
Configuration/Setup utility program to enable the
DIMM slot.
See “Memory settings” on page
31
for additional information.
7.
See “Memory board component locations” on
page
130 for a layout of the memory board.
64
Netfinity Server HMM