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Memory configuration

The BIOS configures the system memory into the best possible configuration after comparing the current FBDIMM population with the desired memory configuration selected by the user in System BIOS. Possible configurations are:

Dual-channel mode (Maximum performance mode)

Single-channel mode

Memory sparing mode

Memory mirroring mode

Only one memory mode can be selected at a time and the BIOS defaults to maximum performance mode. Support is also included for memory sparing, where a portion of each memory board is reserved for failover.

Dual-channel mode

Dual-channel mode (maximum performance mode) is the default memory configuration and provides the highest system performance and increased FBD bandwidth. This requires each lock-stepped pair of FBDIMMs on a branch to be identical. A lock-stepped FBDIMM pair is defined as the FBDIMMs installed in identically numbered FBDIMM sockets on both memory boards (channels) on a given memory branch. No RAS (reliability, availability, and serviceability) features are enabled in this configuration.

To configure memory to maximum performance mode:

1Run BIOS setup. See “Entering BIOS setup” on page 100.

2Use the up and down arrow keys to select the Advanced menu.

3Use the up and down arrow keys to select Memory Configuration, then press Enter. The Memory Configuration menu appears.

4Use the up and down arrow keys to select Memory RAS and Performance Configuration, then press Enter. The Memory RAS and Performance Configuration menu appears.

5Set the Select Memory RAS Configuration to RAS Disabled.

6Press F10 to save changes and exit.

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Acer R920 Series manual Memory configuration, Dual-channel mode, To configure memory to maximum performance mode