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Dell PowerEdge R810

System Memory

Your system supports ECC DDR3 registered DIMMs (RDIMMs). Single-, dual-, and quad-rank DIMMs can be 1066 and 1333 MHz. RDIMMs of capacities 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB are supported for a total of up to 512 GB.

NOTE: The system bus speed is limited to 1066 MHz. DIMMs of speed 1333 MHz will thus operate at 1066 MHz only.

The system consists of 32 memory sockets split into four sets of eight sockets; one set for each processor. Each eight-memory socket set is further organized into four DDR3 memory channels. The first socket of each DDR3 memory channel is marked with a white release lever.

In one- or two-processor configurations, FlexMem Bridges are installed in the adjacent processor sockets to enable the processors installed in sockets 1 and 2 to access the adjacent memory set. For more information, see Table 3-5.

General Memory Module Installation Guidelines

To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory:

NOTE: Memory configurations that fail to observe these guidelines can prevent
your system from starting and producing any video output.

• DIMMs must be populated in matched pairs for each processor (for example, A1/A2, A3/A4). Single DIMM operation is not supported.
• The memory configuration for each processor must be identical for optimal performance.
• Memory modules must be installed beginning with socket A1 or A2 for processor 1, B1 or B2 for processor 2, and C1 or C2 for processor 3, D1 or D2 for processor 4.
• In case of mixed-rank population, first populate the DIMM with the highest number of ranks (in sockets with white release levers).
• If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s).

The system supports memory mirroring and memory sparing for limited configurations. For more information, see Table 3-2 and Table 3-3. 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.

NOTE: The system supports memory mirroring if all DIMM sockets are populated.