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Dell PowerEdge R815

System Memory

Your system supports ECC DDR3 registered DIMMs (RDIMMs) and unbuffered registered DIMMs (UDIMMs). Quad-rank DIMMs of 1066 MHz and single- and dual-rank DIMMs of 1333 MHz are also supported. RDIMMs of capacities 2 GB, 4 GB, and 8 GB are supported for a total of up to 256 GB.

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.

Each channel supports up to two single-, dual-, or quad-rank RDIMMs or two UDIMMs. The interface uses either 2 GB, 4 GB, or 8 GB RDIMMs and 1 GB, 2 GB, or 8 GB UDIMMs.

The following features are available with respect to memory:
• Each processor has four DDR3 channels that support speeds up to 1333 MHz.
• UDIMMs and RDIMMs cannot be mixed.
• Quad-Rank DIMM types support speeds up to 1066 MHz.
• Your system may support online memory sparing.
• Mixing of memory sizes and ranks is allowed for flexibility.
• Up to 256 GB of memory (with 32 8 GB RDIMMs)

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.
• All processor memory channels must be populated identically (same speed, size, and type).
• 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 operate at the speed of the slowest installed memory module(s).
• If online sparing is enabled, identical DIMMs must be installed in the same slots across each channel.

The system supports advanced ECC, memory interleaving, and online sparing. For information on memory configurations, see Table 3-2 and Table 3-3.