Fujitsu D3320 PRIMERGY BX2560 M2 Reference Manual page 32

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uncorrectable errors occur, data cannot be collected from the first
copy, the data is immediately called from the second copy. At the
same time, the memory error is reported to the administrator.
Sparing
The BIOS uses a memory rank as a reserve for the case that too
many correctable errors occur in another memory rank. Before
some uncorrectable error occurs, the content of this memory rank
is routed back into the sparing rank. The potentially defective
memory rank is not used anymore. This procedure is executed
while working. At the same time, the memory error is reported to
the administrator.
NUMA
NUMA (Non-Uniform Memory Access) is a memory architecture for
multiprocessor systems. Each processor has its own local memory, but
it may also access the local memory of the other processors (shared
memory). The access to the local memory is faster than to the shared
memory.
Disabled
The full system memory is divided into many small areas of
interleaved local and shared memory. Should be selected if the
operating system does not support NUMA.
Enabled
The full system memory is divided into areas of non-interleaved
local and shared memory. Best performance with a NUMA aware
ACPI operating system.
DDR Performance
The memory modules may operate at different speeds (frequencies).
The performance will increase at higher speeds, whereas energy saving
will be increased at lower speeds. The possible memory speeds are
depending on the populated memory module configuration.
Energy optimized
Lowest possible speed to save energy.
Performance optimized
Highest possible speed for best performance.
32 D3320 - BIOS Setup Utility
BX2560 M2