System BIOS Intel® 5000 Series Chipsets Server Board Family Datasheet
Revision 1.1
Intel order number D38960-004
36
technology, and size. Therefore, DIMM_A1 and DIMM_B1 must be identical for Branch 1
to work in dual-channel mode.
If the FBDIMMs on adjacent channels of a branch are not identical, the FBDIMM on the
higher channel is disabled.
Rule 8: FBDIMMs on adjacent slots on the same channel do not need to be identical.
Rule 9: The minimum memory upgrade for memory mirroring is four FBDIMMs:
DIMM_A1, DIMM_B1, DIMM_C1 and DIMM_D1. Memory mirroring inherently relies on
the dual-channel mode of operation.
Rule 10 The minimum memory population for memory sparing is two FBDIMMs:
DIMM_A1 and DIMM_A2. The minimum population for memory pair sparing is four
FBDIMMs: DIMM_A1, DIMM_A2, DIMM_B1, and DIMM_B2.
During the memory discovery phase of POST, the BIOS will disable any FBDIMM that does not
conform to the rules.
Note: Memory sparing and mirroring features are currently disabled and will be made available
after production launch.
3.3.7.3 Examples of FBDIMM Population and Upgrade Rules
See the server or workstation Technical Product Specification that applies to your product for
detailed information on FBDIMM population and upgrade rules.
3.3.8 Memory Modes of Operation
Based on the available FBDIMM population, the BIOS will configure the system memory into the
best possible configuration. Possible configurations in RAS mode are:
Single-channel mode
Maximum interleave mode (dual-channel mode)
Memory mirroring mode
DIMM sparing mode (dual or single FBDIMM)
Single-channel and dual-channel modes are special cases when RAS is disabled. In single-
channel mode, only one channel is active on each branch, with the adjacent channel disabled.
In dual-channel mode, the FBDIMMs on adjacent channels on each branch are configured for
maximum interleave in order to provide the optimal lock-step operation.
Note: Memory sparing and mirroring features are currently disabled and will be made available
after production launch.
3.3.9 Memory RAS
Note: Memory sparing and mirroring features are currently disabled and will be made available
after production launch.
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