Dell R515 owner manual Mode-Specific Guidelines, Optimizer Independent Channel Mode, 106

–For dual-rank memory modules:

•One memory module per channel supports up to 1333 MHz.

•Two memory modules per channel support up to 1067 MHz.

–For quad-rank memory modules:

•One memory module per channel supports up to 1333 MHz.

•Two memory modules per channel are limited to 800 MHz, regardless of memory module speed.

•If quad-rank memory modules are mixed with single- or dual-rank modules, the quad-rank modules must be installed in the sockets with the white release levers.

•If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).

Mode-Specific Guidelines

Two memory channels are allocated to each processor. The number of channels used and the allowable configurations depend on the memory mode selected.

Optimizer (Independent Channel) Mode

In this mode, both the channels are populated with identical memory modules. This mode permits a larger total memory capacity but does not support SDDC with x8-based memory modules.

A minimal single-channel configuration of one 1 GB memory module per processor is also supported in this mode.

Table 3-1 and Table 3-2 show sample memory configurations that follow the appropriate memory guidelines stated in this section. The samples show identical memory-module configurations and their physical and available memory totals. The tables do not show mixed or quad-rank memory-module configurations, nor do they address the memory speed considerations of any configuration.

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Installing System Components