Dell PowerEdge T610 - Manual (Page 31)

Dell
PowerEdge T610 Technical Guide 31
o For Memory Mirroring, two channels operate as mirrors of each other—writes go to
both channels and reads alternate between the two channels.

One channel per processor populated
o This is a simple Memory Optimized mode.
o Mirroring is not supported.
7.2.2 DIMM Population Rules
The following DIMM population rules apply:

If DIMMs of different speeds are mixed, all channels will operate at the fastest common
frequency. RDIMMs and UDIMMs cannot be mixed.

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.

The T610 supports up to 12 DIMMs. DIMMs must be installed in each channel starting with the
DIMM slot farthest from the processor. Population order is identified by the silkscreen
designator and the System Information Label (SIL) located on the chassis cover.

DIMM slot population for each memory mode is listed as follows:
o Memory Optimized: [1, 2, 3], [4, 5, 6]
o Advanced ECC or Mirrored: [2, 3], [5, 6]
o Quad Rank or UDIMM: [1, 2, 3], [4, 5, 6]
Figure 8. Memory Channel Layout
7.3 Speed
The memory frequency is determined by a variety of inputs:

Speed of the DIMMs

Speed supported by the processor

Configuration of the DIMMs
The memory speed of each channel depends on the memory configuration:

For single- or dual-rank memory modules:
o One memory module per channel supports up to 1333 MHz
o Two memory modules per channel supports up to 1066 MHz

For quad-rank memory modules:
o One memory module per channel supports up to 1066 MHz
o Two memory modules per channel are limited to 800 MHz, regardless of memory
module speed