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Item Description Socket Color
1 DIMM socket XMM1, Channel A Black
2 DIMM socket XMM2, Channel A White
3 DIMM socket XMM3, Channel B White
4 DIMM socket XMM4, Channel B White
NOTE: A DIMM must occupy the black DIMM1 socket. Otherwise, the system
will display a POST error message indicating that a memory module must be
installed in the black 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 512-MB DIMMs and Channel B is populated with one 1GB 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 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 1-GB DIMM, and three 512-MB DIMMs,
Channel A should be populated with the 1-GB DIMM and one 512-MB DIMM, and Channel B should
be populated with the two 512-MB DIMMs. With this configuration, 2-GB will run as dual channel
and 512-MB will run as single channel.
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In any mode, the maximum operational speed is determined by the slowest DIMM in the system.
CAUTION: The memory module sockets have gold metal contacts. When upgrading the memory, it
is important to use memory modules with gold metal contacts to prevent corrosion and/or oxidation
resulting from having incompatible metals in contact with each other.
Static electricity can damage the electronic components of the computer or optional cards. Before
beginning these procedures, ensure that you are discharged of static electricity by briefly touching a
grounded metal object. Refer to
Electrostatic Discharge Information on page 53 for more information.
When handling a memory module, be careful not to touch any of the contacts. Doing so may damage
the module.
1. Prepare the computer for disassembly (Preparation for Disassembly on page 60).
2. Remove the computer access panel (
Computer Access Panel on page 64).
WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system
components to cool before touching.
70 Chapter 7 Removal and Replacement Procedures Convertible Minitower (CMT) Chassis