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Installing System Components 109
• Memory modules of different sizes can be mixed in A1-A3 or B1-B3
(for example, 2-GB and 4-GB), but all populated channels must have
identical configurations.
• The memory speed of each channel depends on the memory configuration:
– For single- or dual-rank memory modules:
• One memory module per channel supports up to 1333 MHz.
• Two memory modules per channel support up to 1333 MHz.
• Three memory modules per channel support up to 800 MHz.
– For quad-rank memory modules:
• One memory module per channel supports up to 1067 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 will operate at
the speed of the slowest installed memory module(s).
Mode-Specific Guidelines
There are two memory channels with each channel supporting a maximum of
three RDIMMs and two UDIMMs.
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 the 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.
book.book Page 109 Wednesday, August 19, 2009 4:40 PM