System Memory Organization Modes; Single-Channel Mode; Dual-Channel Mode - Intel ® Flex Memory Technology Mode; Intel ® Flex Memory Technology Operation - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 1 01-2011 Datasheet

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2.1.3

System Memory Organization Modes

The IMC supports two memory organization modes—single-channel and dual-channel.
Depending upon how the DIMM Modules are populated in each memory channel, a
number of different configurations can exist.
2.1.3.1

Single-Channel Mode

In this mode, all memory cycles are directed to a single-channel. Single-channel mode
is used when either Channel A or Channel B DIMM connectors are populated in any
order, but not both.
2.1.3.2 Dual-Channel Mode – Intel
The IMC supports Intel Flex Memory Technology Mode. Memory is divided into a
symmetric and an asymmetric zone. The symmetric zone starts at the lowest address
in each channel and is contiguous until the asymmetric zone begins or until the top
address of the channel with the smaller capacity is reached. In this mode, the system
runs with one zone of dual-channel mode and one zone of single-channel mode,
simultaneously, across the whole memory array.
Note: Channels A and B can be mapped for physical channels 0 and 1 respectively or vice
versa; however, channel A size must be greater or equal to channel B size.
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Figure 2-1. Intel Flex Memory Technology Operation
Datasheet, Volume 1
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