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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 non-mirrored configuration, the memory modules must be populated in DIMM slots A1 and B1 first then DIMM slots C1 and D1. It allows both memory branches to operate in parallel and simultaneously to achieve equivalent performance.

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.

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Acer Altos R520 manual Standard memory configuration, Mirrored memory configuration