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If a single DIMM is installed, it must be installed in the XMM3 socket.
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In either mode, the maximum operational speed is determined by the slowest DIMM in the system.
Installing DIMMs
CAUTION You must disconnect the power cord and wait approximately 30 seconds for the
power to drain before adding or removing memory modules. Regardless of the power-on state,
voltage is always supplied to the memory modules as long as the computer is plugged into an
active AC outlet. Adding or removing memory modules while voltage is present may cause
irreparable damage to the memory modules or system board. If you see an LED light on the
system board, voltage is still present.
The memory module sockets have gold-plated metal contacts. When upgrading the memory, it
is important to use memory modules with gold-plated 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. For more information, refer to Appendix D,
Electrostatic Discharge.
When handling a memory module, be careful not to touch any of the contacts. Doing so may
damage the module.
NOTE You must remove the optical drive to add or remove memory modules.
1. Remove/disengage any security devices that prohibit opening the computer.
2. Remove all removable media, such as diskettes or compact discs, from the computer.
3. Turn off the computer properly through the operating system, then turn off any external devices.
4. Disconnect the power cord from the power outlet and disconnect any external devices.
CAUTION You must disconnect the power cord and wait approximately 30 seconds for
the power to drain before adding or removing memory modules. Regardless of the power-
on state, voltage is always supplied to the memory modules as long as the computer is
plugged into an active AC outlet. Adding or removing memory modules while voltage is
present may cause irreparable damage to the memory modules or system board. If you see
an LED light on the system board, voltage is still present.
5. If the computer is on a stand, remove the computer from the stand.
6. Remove the access panel.
7. Locate the memory module sockets on the system board.
WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system
components to cool before touching.
8. Disconnect the power and data cables from the back of the optical drive.
ENWW Installing Additional Memory 17
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