Memory Sparing And Mirroring; Figure 12. Channel Slots Configuration - Intel SR1695WB Service Manual

The Independent Channel Mode is the default Maximum Performance Mode preferred for
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Intel Xeon
populated in any order and have no matching requirements. All channels must run at the
same interface frequency, but individual channels may run at different DIMM timings
(RAS latency, CAS latency, and so forth).

Memory Sparing and Mirroring

The spare mode is not supported by Intel
With memory mirroring, the system maintains two copies of all data in the memory
subsystem. If a DIMM fails, the data is not lost because the second copy of the data is
available from the mirrored DIMM in the opposite channel. The system will not fail due
to memory error unless both the primary and the mirrored copy of the data become corrupt
at the same time.
In a mirrored system, the maximum usable memory is one-half of the installed memory,
with a minimum of two DIMMs installed. Since the data is duplicated across DIMMs, it
means that up to one-half of the installed DIMMs are actively in use at any one time. The
remaining DIMMs are used for mirroring.
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Intel Server System SR1695WB Service Guide

Figure 12. Channel Slots Configuration

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Processor 5500 or 5600 series based platforms. All three channels may be
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Server System SR1695WB.
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