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-rankmodules, the quad-rank modules must be installed in the socketswith the white release levers.• If memory modules with different speeds are installed, they operate at thespeed of the slowest installed memory module(s).Mode-Specific GuidelinesTwo memory channels are allocated to each processor. The number ofchannels used and the allowable configurations depend on the memory modeselected.Optimizer (Independent Channel) ModeIn this mode, both the channels are populated with identical memorymodules. This mode permits a larger total memory capacity but does notsupport SDDC with x8-based memory modules.A minimal single-channel configuration of one 1 GB memory module perprocessor is also supported in this mode.Table 3-1 and Table 3-2 show sample memory configurations that follow theappropriate memory guidelines stated in this section. The samples showidentical memory-module configurations and their physical and availablememory totals. The tables do not show mixed or quad-rank memory-moduleconfigurations, nor do they address the memory speed considerations of anyconfiguration.
