Hardware Reference Guide
DIMM and one 1 GB DIMM, and Channel B should be populated with the other two 1 GB DIMMs. With this
conguration, 4 GB will run as dual-channel and 1 GB will run as single-channel.
● In any mode, the maximum operational speed is determined by the slowest DIMM in the system.
IMPORTANT: 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.
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
briey touching a grounded metal
object. For more information, refer to Electrostatic discharge on page 45.
When handling a memory module, be careful not to touch any of the contacts. Doing so may damage the
module.
1. Prepare for disassembly. See Preparing for disassembly on page 6.
2. Remove the computer access panel. See Removing the computer access panel on page 6.
WARNING! To reduce risk of personal injury from hot surfaces, allow the internal system components
to cool before you touch them.
16 Chapter 2 Hardware upgrades