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Installing System Components 107
• For Memory Mirroring or Advanced ECC Mode, the socket furthest from
the processor is unused and memory modules are installed beginning with
socket A1 or B1 and proceeding with socket A2 or B2.
• Advanced ECC Mode requires memory modules that use x4 or x8 DRAM
device widths.
• 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 supports up to 1067 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
Three memory channels are allocated to each processor. The number of
channels and allowable configurations depend on the memory mode selected.
Advanced ECC (Lockstep) Mode Support
In this configuration, the two channels closest to the processor are combined
to form one 128-bit channel. This mode supports SDDC for both x4- and x8-
based memory modules. Memory modules must be identical in size, speed,
and technology in corresponding slots.
book.book Page 107 Tuesday, June 9, 2009 4:09 PM