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106 Installing System Components
System Memory
Your system supports DDR3 registered memory modules (RDIMMs) or ECC
unbuffered memory modules (UDIMMs). Single and dual-rank memory
modules can be 1067- or 1333-MHz, and quad-rank memory modules can be
1067-MHz.
The system contains eight memory sockets split into two sets of four sockets,
one set per each processor. Each four-socket set is organized into two DIMMs
for channel 0 and a single DIMM for channel 1 and channel 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 and dual-rank RDIMMs of sizes 2-GB, 4-GB, and 8-GB
(when available) are supported for a total of up to 64 GB.
• Quad-rank RDIMMs are supported for a
total of up to
64 GB.
• 1-GB and 2-GB UDIMMs are supported for a total of up to 16 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 or producing any video output.
• RDIMMs and UDIMMs cannot be mixed.
• Except for memory channels that are unused, all populated memory
channels must have identical configurations.
• In a dual-processor configuration, the memory configuration for each
processor must be identical.
• 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. This applies to only channel 0.
• For Optimizer Mode, memory modules are installed in the numeric order
of the sockets beginning with A1 or B1.
book.book Page 106 Tuesday, June 9, 2009 4:09 PM