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9-40 Upgrading Your Server
Memory Clock
Memory clock speed depends on CPU model and whether the additional 8GB memory board is
installed or not.
Xeon E5502/E5504
Always operates at 800MHz regardless of DIMM type.
Xeon E5520/X5550/X5570
Operates at 800MHz when the following conditions are satisfied. In other cases, operates
at 1066MHz. The memory clock is stationary for each CPU.
<Condition>
Additional 8GB memory board is installed and each CPU has four or more DIMMs
installed.
<Example>
Operates at 800MHz
Memory RAS Feature
Your server supports Memory RAS feature (memory mirroring and LockStep features). For
configuration, see "Using the Memory RAS Features" described later.
To use Memory RAS feature, you need to remove the factory-installed DIMMs and install
2GB/4GB/8GB/16GB DIMMs.
Operates at 1066MHz
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