F–2 437804-001 Service Reference Guide, dc5700
Memory
The system board shown may differ from the one in your product.
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
■ The system will operate in single channel mode if the DIMM sockets are populated in one
channel only.
■ 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 256MB DIMMs and Channel B is populated with one
512MB 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. For example, if you are populating the sockets with one 1GB DIMM, two
512MB DIMMs, and one 256MB DIMM, one channel should be populated with the 1GB
DIMM and one 256MB DIMM and the other channel should be populated with the two
512MB DIMMs. With this configuration, 2 GB will run as dual channel and 256 MB will run
as single channel.
■ In any mode, the maximum operational speed is determined by the slowest DIMM in the
system.
Item Description Socket Color
1 DIMM socket XMM1, Channel A,
populate first
Black
2 DIMM socket XMM2, Channel A White
3 DIMM socket XMM3, Channel B,
populate second
Black
4 DIMM socket XMM4, Channel B White
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