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Installing System Components 73
System Memory
Your system supports DDR3 ECC unbuffered memory modules (UDIMMs).
The DIMMs can be 1066 or 1333 MHz. Single and dual-rank DIMMs can be
1066 or 1333 MHz.
The system contains four memory sockets, each two-socket set is organized
into two channels. The first socket of each channel is marked with white
release levers.
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 or producing any video output.
• Except for memory channels that are unused, all populated memory
channels must have identical configurations.
• Memory modules of different sizes can be mixed within a memory channel
(for example, 2 GB and 4 GB), but all populated channels must have
identical configurations.
• Memory modules are installed in the numeric order of the sockets
beginning with DIMM_A1 or DIMM_B1.
• One or two DIMMs per channel can support up to 1333 MHz.
• If memory modules with different speeds are installed, they operate at the
speed of the slowest installed memory module(s).
Mode-Specific Guidelines
Your system supports both single-channel and dual-channel mode. A minimal
single-channel configuration of one 1 GB memory module is also supported
in this mode.
Table 3-2 shows sample memory configurations that follow the appropriate
memory guidelines stated in this section. The samples show identical
memory-module configurations and their the physical and available memory
totals. The table does not show mixed memory-module configurations, nor
do they address the memory speed considerations of any configuration.