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Standard memory configuration
The system is capable of supporting a minimum of only one FBDIMM installed on the DIMM A1 slot. However, for system performance reasons, we recommend that at least two memory modules must be installed per branch. The modules must cover the same slot position on both channels and FBDIMM pairs must be identical with respect to size, speed, and organization. FBDIMMs that cover adjacent slot positions do not need to be identical.
When adding four FBDIMMs to a standard
Mirrored memory configuration
Memory mirroring is implemented in the MCH and the system BIOS. You can configure the system to maintain mirrored copy of the data in memory. When operating in mirrored mode, both branches operate in lock step. In mirrored mode, branch 1 contains a replicate copy of the data in branch 0. The minimum FBDIMM configuration to support memory mirroring is four FBDIMMs, populated as shown in the figure below:
All four memory modules must be identical with respect to size, speed, and organization.