Installing A Dimm - IBM 9228 - IntelliStation Z - Pro Service Manual

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
v The system board contains eight DIMM connectors and supports two-way
v Install only 1.8 V, 240-pin, 667 MHz, PC2-5300, DDR2 synchronous dynamic
v The amount of usable memory will be reduced depending on the system
v The DIMM options that are available for the computer are 512 MB, 1 GB, 2 GB,
v The memory controller has four fully buffered DIMM channels that are organized
v The computer can operate in two major modes, mirroring and non-mirroring
v The computer supports memory mirroring (mirroring mode) and online-spare
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IBM IntelliStation Z Pro Type 9228 and 9232: Problem Determination and Service Guide
displays a message that the memory configuration has changed.
memory interleaving.
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.
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.
and 4 GB, which come in matched pairs. The computer supports a minimum of
1GB and a maximum of 32 GB of system memory.
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 1
Channel 0 Channel 1
Branch 0
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.
(normal). The computer can also operate in a single-channel mode when one
DIMM is installed.
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.
DIMM 4 DIMM 6
DIMM 3
DIMM 5
Channel 2
Branch 1
Memory Controller
DIMM 8
DIMM 7
Channel 3