Dell DX6000 User Manual download pdf (Page 132)

132 Installing System Components

• Three memory modules per channel are limited to 800 MHz,

regardless of memory module speed.

– For quad-rank memory modules:

• One memory module per channel supports up to 1067 MHz.

• Two memory modules per channel are limited to 800 MHz,

regardless of memory module speed.

• If a quad-rank memory module is installed, then only one other memory

module can be added to that channel.

• 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 will operate at

the speed of the slowest installed memory module(s).

Mode-Specific Guidelines

The number of channels and allowable configurations depend on the memory

mode selected.

Advanced ECC (Lockstep) Mode Support

In this configuration, the two channels closest to the processor are combined

to form one 128-bit channel. This mode supports SDDC for both x4- and x8-

based memory modules. Memory modules must be identical in size, speed,

and technology in corresponding slots.

Memory Mirroring Support

The system supports memory mirroring if identical memory modules are

installed in

the two channels closest to the processor

(memory is not installed

in the farthest channel). Mirroring must be enabled in the System Setup

program. In a mirrored configuration, the total available system memory is one-

half of the total installed physical memory.

Optimizer (Independent Channel) Mode

In this mode, all three 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.

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Dell DX6000 User Manual Page 132