HP EliteDesk 800 G4 Tower PC User Manual download pdf (Page 34)

DIMM and one 1 GB DIMM, and Channel B should be populated with the other two 1 GB DIMMs. With this

conguration, 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.

Removing and installing DIMMs

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

briey touching a grounded metal

object. For more information, refer to Electrostatic discharge information on page 10.

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 18)

2. Remove the access panel (Access panel on page 19)

3. To remove a memory module, open both latches of the memory module socket (1), and then remove the

memory module from the socket (2).

4. To install a memory module, open both latches of the memory module socket (1), and insert the

memory module into the socket (2).

NOTE: A memory module can be installed in only one way. Match the notch on the module with the tab

on the memory socket.

Populate the black DIMM sockets before the white DIMM sockets.

For maximum performance, populate the sockets so that the memory capacity is spread as equally as

possible between Channel A and Channel B.

26 Chapter 4 Removal and replacement procedures

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HP EliteDesk 800 G4 Tower PC User Manual Page 34