Dell PowerEdge M710 Technical Guide
23
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Typically, two channels operate in Advanced ECC (Lockstep) mode with each other by
having the cache line split across both channels. This mode provides improved RAS
features (SDDC support for x8-based memory).
•
Memory mirroring:
two channels operate as mirrors of each other—writes go to both channels
and reads alternate between the two channels.
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One channel per CPU populated
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This is a simple Memory Optimized mode. No mirroring or sparing is supported.
The PowerEdge M710 memory interface supports memory demand and patrol scrubbing, single-bit
correction and multi-bit error detection. Correction of a device failure is also possible with SDDC in
the Advanced ECC mode. Additionally, correction of an x4 device failure is possible in the Memory
Optimized mode. RDIMMs and UDIMMs cannot be mixed.
•
If DIMMs of different speeds are mixed, all channels will operate at the fastest common
frequency.
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RDIMMs and UDIMMs cannot be mixed.
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If memory mirroring is enabled, identical DIMMs must be installed in the same slots across
both channels. The third channel of each processor is unavailable for memory mirroring.
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The first DIMM slot in each channel is color-coded with white ejection tabs for ease of
installation.
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The DIMM sockets are placed 450 mils (11.43 mm) apart, center-to-center in order to provide
enough space for sufficient airflow to cool stacked DIMMs.
•
The PE M710 supports up to 18 DIMMs. DIMMs must be installed in each channel starting with
the DIMM farthest from the processor. Population order is identified by the silkscreen
designator and the System Information Label (SIL) located on the chassis cover.
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Memory Optimized: {1, 2, 3}, {4, 5, 6}, {7, 8, 9}
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Advanced ECC or Mirrored: {2, 3}, {5, 6}, {8, 9}
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Quad Rank or UDIMM: {1, 2, 3}, {4, 5, 6}, {7, 8, 9}
While 800 MT/s DIMMs are not supported, the installation of two quad rank 1066MT/s or three single-
or dual-rank 1333MT/s DIMMs will operate at 800MT/s.
For detailed information, see the System Memory section of the
Dell PowerEdge Modular Systems
Hardware Owner’s Manual
on
Support.Dell.com/Manuals
.
7.3
Slots/Risers
Figure 5 illustrates memory slots and risers. For detailed information, see the System Memory section
of the
Dell PowerEdge Modular Systems Hardware Owner’s Manual
on
Support.Dell.com/Manuals
.
