The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the SODIMMs are installed.
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The system will operate in single channel mode if the SODIMM 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 SODIMMs in Channel A is equal to the total memory capacity of the SODIMMs in Channel
B. The technology and device width can vary between the channels. For example, if Channel A
is populated with two 1 GB SODIMMs and Channel B is populated with one 2 GB SODIMM, 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 SODIMMs in Channel A
is not equal to the total memory capacity of the SODIMMs 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 will have more memory than the other, the larger amount should be
assigned to Channel A. For example, if you are populating the sockets with one 2 GB SODIMM,
and three 1 GB SODIMMs, Channel A should be populated with the 2 GB SODIMM and one 1
GB SODIMM, and Channel B should be populated with the other two 1 GB SODIMMs. With this
configuration, 4 GB will run as dual channel and 1 GB will run as single channel.
Installing SODIMMS
When facing the rear of the computer, there are four memory sockets located behind the large access
panel on the right. You must remove this panel to remove or install memory.
CAUTION: Static electricity can damage the electronic components of the computer. Before
beginning these procedures, ensure that you are discharged of static electricity by briefly touching a
grounded metal object.
When handling a memory module, be careful not to touch any of the contacts. Doing so may damage
the module.
To remove or install memory modules:
1. Prepare the computer for disassembly (see
Preparing to disassemble the computer on page 33).
2. Remove the right rear panel (see
Rear panels on page 46).
Installing memory 51
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