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Installing System Components 105
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.
book.book Page 105 Tuesday, August 24, 2010 1:47 PM