HP Integrity rx2800 Installation Guide - Page 35

Supported DIMM sizes, Memory loading rules and guidelines, Installing DIMMs

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TIP: Loading pairs on a single riser at a time is also supported, but the system will not have maximum performance. Supported DIMM sizes DIMMs seat onto the four memory riser boards, which seat on the system board. The minimum server configuration requires at least one memory pair (group of two DIMMs) installed on memory riser board 1. The server supports the following DIMM sizes: • 2 GB • 4 GB • 8 GB Future release Memory loading rules and guidelines CAUTION: Failure to observe the following cautions results in system degradation or failure: • Only ECC DIMMs are supported. • Load DIMM pairs in order of size from largest to smallest capacity. For example, if you have a pair of 4 GB DIMMs and a pair of 2 GB DIMMs, install the pair of 4 GB DIMMs first. NOTE: Faster DIMMs and Slow DIMMs can be installed on different slots within the same channel, but faster DIMMs will be operated at timing of slowest DIMM populated. • Alternate loading between installed CPUs. Do not install DIMMs if the corresponding processor is not installed. • Spread DIMMs evenly between CPUs. • Load DIMMs in pairs by increasing letter. • For best performance, install DIMM pairs in the specified order shown in Table 2-2. DIMMs can be loaded in an economic order, for example, loading the 1st riser full before loading DIMMs on other memory risers, but the DIMMs must still following the basic DIMM load order: - Load highest density DIMMs first. - Load DIMMs in pairs by increasing letter. • Mixed DIMM types are supported with the following qualifications: - DIMMs with x4 and x8 modes can be mixed - DIMMs with different size can be mixed - DIMMs with different row, column, bank and rank number can be mixed. - Do not mix unbuffered (UDIMMs) with registered (RDIMMs) DIMMs. - A maximum of 2 UDIMMs per channel can be installed. - If quad-rank DIMMs are installed for a processor, a maximum of two DIMMs can be installed on each channel for that processor. - If a channel contains quad-rank DIMMs, the quad-rank DIMM must be installed first on the channel. - Faster DIMMs and Slow DIMMs can be installed on different slots within the same channel, but faster DIMMs will be operated at timing of slowest DIMM populated. Installing DIMMs To instal the component: Installing Additional Components 35

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TIP:
Loading pairs on a single riser at a time is also supported, but the system will not have
maximum performance.
Supported DIMM sizes
DIMMs seat onto the four memory riser boards, which seat on the system board. The minimum
server configuration requires at least one memory pair (group of two DIMMs) installed on
memory riser board 1.
The server supports the following DIMM sizes:
•
2 GB
•
4 GB
•
8 GB
Future release
Memory loading rules and guidelines
CAUTION:
Failure to observe the following cautions results in system degradation or failure:
•
Only ECC DIMMs are supported.
•
Load DIMM pairs in order of size from largest to smallest capacity. For example, if you have
a pair of 4 GB DIMMs and a pair of 2 GB DIMMs, install the pair of 4 GB DIMMs first.
NOTE:
Faster DIMMs and Slow DIMMs can be installed on different slots within the same
channel, but faster DIMMs will be operated at timing of slowest DIMM populated.
•
Alternate loading between installed CPUs. Do not install DIMMs if the corresponding
processor is not installed.
•
Spread DIMMs evenly between CPUs.
•
Load DIMMs in pairs by increasing letter.
•
For best performance, install DIMM pairs in the specified order shown in
Table 2-2
. DIMMs
can be loaded in an economic order, for example, loading the 1st riser full before loading
DIMMs on other memory risers, but the DIMMs must still following the basic DIMM load
order:
—
Load highest density DIMMs first.
—
Load DIMMs in pairs by increasing letter.
•
Mixed DIMM types are supported with the following qualifications:
—
DIMMs with x4 and x8 modes can be mixed
—
DIMMs with different size can be mixed
—
DIMMs with different row, column, bank and rank number can be mixed.
—
Do not mix unbuffered (UDIMMs) with registered (RDIMMs) DIMMs.
—
A maximum of 2 UDIMMs per channel can be installed.
—
If quad-rank DIMMs are installed for a processor, a maximum of two DIMMs can be
installed on each channel for that processor.
—
If a channel contains quad-rank DIMMs, the quad-rank DIMM must be installed first
on the channel.
—
Faster DIMMs and Slow DIMMs can be installed on different slots within the same
channel, but faster DIMMs will be operated at timing of slowest DIMM populated.
Installing DIMMs
To instal the component:
Installing Additional Components
35