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Dell PowerEdge R515

System Memory
Your system supports standard (1.5 V) DDR3 and low voltage (1.35 V) DDR3L registered DIMMs (RDIMMs) or unbuffered ECC DIMMs (UDIMMs). Single and dual-rank DIMMs can be 1067 MHz or 1333 MHz, and quad-rank DIMMs can be 800 MHz or 1067 MHz.

The system contains eight memory sockets split into two sets of four sockets, one set per processor. Each four-socket set is organized into three channels. Two DIMMs for channel 0 and a single DIMM for channel 1 and 2. The first socket of each channel is marked with white release levers.

The maximum memory that is supported on your system varies according to the types and sizes of memory modules being used:
• Single-rank, dual-rank, and quad-rank RDIMMs of sizes 2 GB, 4 GB, 8 GB, and 16 GB are supported for a total of up to 128 GB.
• 1 GB, 2 GB, and 4 GB UDIMMs are supported for a total of up to 32 GB.

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.

• 1.35 V DDR3L memory operates the memory modules at 1.5 V, if any of the following conditions exist:
– Two 1333 MHz DIMMs per channel.
– A combination of both standard and low voltage memory modules.
• RDIMMs and UDIMMs cannot be mixed.
• Except for memory channels that are unused, all populated memory channels must have identical configurations.
• The memory configuration for each processor must be identical.
• Memory modules of different sizes can be mixed in A1-A4 or B1-B4 (for example, 2 GB and 4 GB), but all populated channels must have identical configurations.
• For Optimizer Mode, memory modules are installed in the numeric order of the sockets beginning with A1 or B1.
• The memory speed of each channel depends on the memory configuration:
– For single rank memory modules:
• One memory module per channel supports up to 1333 MHz.
• Two memory modules per channel support up to 1333 MHz.
– For dual-rank memory modules:
• One memory module per channel supports up to 1333 MHz.
• Two memory modules per channel support up to 1067 MHz.
– For quad-rank memory modules:
• One memory module per channel supports up to 1333 MHz.
• Two memory modules per channel are limited to 800 MHz, regardless of memory module speed.
• If quad-rank memory modules are mixed with single- or dual-rank modules, the quad-rank modules must be installed in the sockets with the white release levers.
• If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).

Mode-Specific Guidelines
Two memory channels are allocated to each processor. The number of channels used and the allowable configurations depend on the memory mode selected.

Optimizer (Independent Channel) Mode
In this mode, both the channels are populated with identical memory modules. This mode permits a larger total memory capacity but does not support SDDC with x8-based memory modules.

A minimal single-channel configuration of one 1 GB memory module per processor is also supported in this mode.

Table 3-1 and Table 3-2 show sample memory configurations that follow the appropriate memory guidelines stated in this section. The samples show identical memory-module configurations and their physical and available memory totals. The tables do not show mixed or quad-rank memory-module configurations, nor do they address the memory speed considerations of any configuration.