Sparing; Memory Scrubbing; Advanced Ecc (Lockstep) Mode; Optimizer (Independent Channel) Mode - Dell External OEMR R710 Technical Manual

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7.7 Sparing

Systems with the Intel Xeon processor 5600 series support memory sparing. Sparing requires identical
memory installed in all three channels. One of the three channels is considered the Spare Channel,
and two-thirds of the total installed memory is usable and is the amount reported during POST and in
BIOS setup.

7.8 Memory Scrubbing

The PowerEdge R710 memory interface supports memory demand and patrol scrubbing, single-bit
correction and multi-bit error detection. Correction of a x4 or x8 device failure is also possible with
SDDC in the Advanced ECC mode. Additionally, correction of a x4 device failure is possible in the
Memory Optimized mode.

7.9 Advanced ECC (Lockstep) Mode

In Advanced ECC (Lockstep) mode, the two channels closest to the processor are combined to form
one 128-bit channel. This mode supports Single Device Data Correction (SDDC) for both x4- and x8-
based memory modules. Memory modules must be identical in size, speed and technology in
corresponding slots.

7.10 Optimizer (Independent Channel) Mode

In Optimizer (Independent Channel) 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.
A minimal single-channel configuration of 1 GB memory modules per processor is also supported in
this mode.

7.11 Supported Configurations

See the System Memory section in the Installing System Components chapter in the Dell PowerEdge
R710 Systems Hardware Owner's Manual on Support.dell.com.
PowerEdge R710 Technical Guide 33