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Populating DIMM Sockets
There are four DIMM sockets on the system board, with two sockets per channel. The sockets are
labeled XMM1, XMM2, XMM3, and XMM4. Sockets XMM1 and XMM2 operate in memory channel A.
Sockets XMM3 and XMM4 operate in memory channel B.
Figure 2-7 DIMM Socket Locations
Table 2-1 DIMM Socket Locations
Item Description Socket Color
1 XMM1 socket, Channel A (populate first) Black
2 XMM2 socket, Channel A (populate third) White
3 XMM3 socket, Channel B (populate second) White
4 XMM4 socket, Channel B (populate fourth) White
NOTE: A DIMM must occupy the black XMM1 socket. Otherwise, the system will display
a POST error message indicating that a memory module must be installed in the wrong
socket.
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
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The system will operate in single channel mode if the DIMM sockets are populated in one channel
only.
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The system will operate in a higher-performing dual channel mode if the total memory capacity of
the DIMMs in Channel A is equal to the total memory capacity of the DIMMs in Channel B. The
technology and device width can vary between the channels. For example, if Channel A is
populated with two 1-GB DIMMs and Channel B is populated with one 2-GB DIMM, the system will
operate in dual channel mode.
●
The system will operate in flex mode if the total memory capacity of the DIMMs in Channel A is not
equal to the total memory capacity of the DIMMs in Channel B. In flex mode, the channel populated
with the least amount of memory describes the total amount of memory assigned to dual channel
and the remainder is assigned to single channel. For optimal speed, the channels should be
balanced so that the largest amount of memory is spread between the two channels. If one channel
ENWW Installing Additional Memory 17