46 IBM eX5 Implementation Guide
Figure 2-26 UEFI Memory system settings panel
The following memory feature options are available:
Memory Spare Mode (Default:
Disable)
This option enables memory sparing mode, as described in “Memory sparing” on page 29.
Memory Mirror Mode (Default:
Non-Mirrored)
This option enables memory mirroring mode, as described in “Memory mirroring” on
page 28.
Memory Speed (Default:
Max Performance)
This option sets the operating frequency of the installed DIMMs:
– Minimal Power provides less performance for better power savings.
The memory operates at the lowest supported frequency, which, in the eX5 systems, is
800 MHz.
– Power Efficiency provides the best performance per watt ratio.
The memory operates one step under the rated frequency, that is, 977 MHz for DIMMs
that are rated at 1066 MHz or higher.
–
Max Performance provides the best system performance.
The memory operates at the rated frequency, that is, 1066 MHz for DIMMs rated at
1066 MHz or higher.
Memory Mirror Mode: Memory Mirror Mode cannot be used in conjunction with
Memory Spare Mode.
Tip: Although memory DIMMs rated at 1333MHz are supported on eX5 servers, the
currently supported maximum memory operating frequency is 1066 MHz.
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