Service and Maintain

Populating DIMM sockets
Populate the DIMM sockets in the following order: XMM2, XMM1 or Channel A, Channel B.
Description Socket Color Insertion Order
XMM1 socket, Channel A Blue 2
XMM2 socket, Channel A (populate first) Blue 1
NOTE: A memory module must occupy the XMM1/Channel A 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 one 2-GB DIMM and Channel B is populated with one 4-GB DIMM, the system will
operate in dual channel mode.
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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
36 Chapter 7 Removal and replacement procedures