Intel S5500BC User Guide - Page 31
Memory Sparing and Mirroring - maximum memory
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Figure 6. Channel Slots Configuration The Independent Channel Mode is the default Maximum Performance Mode preferred for Intel® Xeon® 5500 processor series based platforms. You can populate all three channels 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 the Intel® Server Board S5500BC. 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. Intel® Server Board S5500BC User's Guide 11
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