User Manual

Dell
PowerEdge R710 Technical Guide 32
o Memory modules are installed in numeric order for the sockets beginning with A1 or B1.
• The first two channels per processor populated identically with the third channel unused
o Typically, two channels operate in Advanced ECC (Lockstep) mode with each other by having
the cache line split across both channels.
o This mode provides improved RAS features (SDDC support for x8-based memory).
o For memory mirroring, two channels operate as mirrors of each other (writes go to both
channels and reads alternate between the two channels).
o For Memory Mirroring or Advanced ECC Mode, the three sockets farthest from the processor are
unused and memory modules are installed beginning with socket A2 or B2, proceeding in the
following order: A2, A3, A5, and A6.
• One channel per processor populated
o This is a simple Memory Optimized mode.
o Mirroring is not supported.
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 R710 memory system 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.
DIMM slot population for each memory mode is listed as follows:
• Memory Optimized: [1, 2, 3], [4, 5, 6], [7, 8, 9]
• Advanced ECC or Mirrored: [2, 3], [5, 6], [8, 9]
• Quad Rank or UDIMM: [1,2,3], [4,5,6]
See the figure below for the layout of the R710 memory channels.