IBM 9228 Service Guide - Page 60

Installing a DIMM, to the smallest DIMM for example 2 GB, 1 GB, 512 MB. Populating DIMMs

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Installing a DIMM The following notes describe the types of DIMMs that the computer supports and other information that you must consider when installing DIMMs: v When you restart the computer after adding or removing a DIMM, the computer displays a message that the memory configuration has changed. v The system board contains eight DIMM connectors and supports two-way memory interleaving. v Install only 1.8 V, 240-pin, 667 MHz, PC2-5300, DDR2 synchronous dynamic random-access memory (SDRAM) with error correcting code (ECC) fully buffered DIMMs. These DIMMs must be compatible with the latest PC2-5300 SDRAM, fully buffered DIMM specification. For a list of supported options for the computer, go to http://www.ibm.com/intellistation/; then, select your country and navigate to the list of options for the computer. v The amount of usable memory will be reduced depending on the system configuration. A certain amount of memory must be reserved for system resources. The basic input/output system (BIOS) displays the total amount of installed memory and the amount of configured memory. v The DIMM options that are available for the computer are 512 MB, 1 GB, 2 GB, and 4 GB, which come in matched pairs. The computer supports a minimum of 1GB and a maximum of 32 GB of system memory. v The memory controller has four fully buffered DIMM channels that are organized into two branches. Each branch has two channels, and each channel controls two DIMMs. DIMMs within the channels of a branch must be identical in size, type, speed, and technology. The following illustration shows how the memory controller is organized into branches and channels with two pairs of DIMMs installed. DIMM 2 DIMM 4 DIMM 6 DIMM 8 DIMM 1 DIMM 3 DIMM 5 DIMM 7 Channel 0 Channel 1 Branch 0 Channel 2 Channel 3 Branch 1 Memory Controller Note: The DIMMs in the computer should be populated from the largest DIMM to the smallest DIMM (for example 2 GB, 1 GB, 512 MB). Populating DIMMs from the largest capacity to the smallest capacity will yield better performance, enabling the operating system to access more of the system memory before passing through the advanced memory buffer (AMB) to access the second DIMM on the channel. v The computer can operate in two major modes, mirroring and non-mirroring (normal). The computer can also operate in a single-channel mode when one DIMM is installed. v The computer supports memory mirroring (mirroring mode) and online-spare memory. - Memory mirroring replicates data in two pairs of DIMMs simultaneously, this allows the computer to continue working if one set of DIMMs fail. When you use memory mirroring, consider the following information: - The memory is reduced to half the amount of memory available. For example, the maximum available memory is reduced from 32 GB to 16 GB in the mirroring mode. 42 IBM IntelliStation Z Pro Type 9228 and 9232: Problem Determination and Service Guide

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Installing a DIMM
The following notes describe the types of DIMMs that the computer supports and
other information that you must consider when installing DIMMs:
v
When you restart the computer after adding or removing a DIMM, the computer
displays a message that the memory configuration has changed.
v
The system board contains eight DIMM connectors and supports two-way
memory interleaving.
v
Install only 1.8 V, 240-pin, 667 MHz, PC2-5300, DDR2 synchronous dynamic
random-access memory (SDRAM) with error correcting code (ECC) fully buffered
DIMMs. These DIMMs must be compatible with the latest PC2-5300 SDRAM,
fully buffered DIMM specification. For a list of supported options for the computer,
go to http://www.ibm.com/intellistation/; then, select your country and navigate to
the list of options for the computer.
v
The amount of usable memory will be reduced depending on the system
configuration. A certain amount of memory must be reserved for system
resources. The basic input/output system (BIOS) displays the total amount of
installed memory and the amount of configured memory.
v
The DIMM options that are available for the computer are 512 MB, 1 GB, 2 GB,
and 4 GB, which come in matched pairs. The computer supports a minimum of
1GB and a maximum of 32 GB of system memory.
v
The memory controller has four fully buffered DIMM channels that are organized
into two branches. Each branch has two channels, and each channel controls
two DIMMs. DIMMs within the channels of a branch must be identical in size,
type, speed, and technology. The following illustration shows how the memory
controller is organized into branches and channels with two pairs of DIMMs
installed.
DIMM 2
DIMM 3
DIMM 1
DIMM 5
DIMM 6
DIMM 4
DIMM 8
DIMM 7
Memory Controller
Branch 0
Branch 1
Channel 0
Channel 1
Channel 2
Channel 3
Note:
The DIMMs in the computer should be populated from the largest DIMM
to the smallest DIMM (for example 2 GB, 1 GB, 512 MB). Populating DIMMs
from the largest capacity to the smallest capacity will yield better performance,
enabling the operating system to access more of the system memory before
passing through the advanced memory buffer (AMB) to access the second DIMM
on the channel.
v
The computer can operate in two major modes, mirroring and non-mirroring
(normal). The computer can also operate in a single-channel mode when one
DIMM is installed.
v
The computer supports memory mirroring (mirroring mode) and online-spare
memory.
–
Memory mirroring replicates data in two pairs of DIMMs simultaneously, this
allows the computer to continue working if one set of DIMMs fail.
When you use memory mirroring, consider the following information:
-
The memory is reduced to half the amount of memory available. For
example, the maximum available memory is reduced from 32 GB to 16 GB
in the mirroring mode.
42
IBM IntelliStation Z Pro Type 9228 and 9232: Problem Determination and Service Guide