HP Compaq dc7700 SFF User's Guide download pdf (Page 24)

one 1GB DIMM. 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.

Installing DIMMs

CAUTION You must disconnect the power cord 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 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.

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 Regardless of the power-on state, voltage is always present on the system

board as long as the system is plugged into an active AC outlet. You must disconnect the

power cord to avoid damage to the internal components of the computer.

5. If the computer is on a stand, remove the computer from the stand and lay the computer down.

6. Remove the computer access panel.

CAUTION After opening the computer cover, look for the LED on the system board

between the DIMM sockets. If the LED is illuminated, the system still has power. Turn off

the computer and remove the power cord before proceeding.

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.

18 Chapter 2 Hardware Upgrades ENWW

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HP Compaq dc7700 SFF User's Guide Page 24