Dell POWEREDGE R515 - Manual (Page 106)

106 Installing System Components
– 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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