HP EliteDesk 800 G6 Maintenance and Service Guide - Page 34

DIMM1, and DIMM4. Sockets DIMM1 and DIMM2 operate in memory channel B. Sockets DIMM3, IMPORTANT

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NOTE: The system does not operate properly if you install unsupported memory modules. There are four memory sockets on the system board, with two sockets per channel. The sockets are labeled DIMM1, DIMM2, DIMM3, and DIMM4. Sockets DIMM1 and DIMM2 operate in memory channel B. Sockets DIMM3 and DIMM4 operate in memory channel A. The system automatically operates in single-channel mode, dual-channel mode, or flex mode, depending on how the DIMMs are installed. NOTE: Single-channel and unbalanced dual-channel memory configurations results in inferior graphics performance. ● The system operates in single-channel mode if the DIMM sockets are populated in one channel only. ● 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 1 GB DIMMs and channel B is populated with one 2 GB DIMM, the system will operate in dual-channel mode. ● The system operates 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 2 GB DIMM, and three 1 GB DIMMs, channel A should be populated with the 2 GB DIMM and one 1 GB DIMM, and channel B should be populated with the other two 1 GB DIMMs. With this configuration, 4 GB runs 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 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 can 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, oxidation, or both 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, be sure that you are discharged of static electricity by briefly touching a grounded metal object. For more information, see Electrostatic discharge information on page 10. When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the module. Before replacing the memory modules, follow these steps: 1. Prepare the computer for disassembly (Preparation for disassembly on page 19). 2. Remove the access panel (Access panel on page 19). 3. Remove the optical drive (Optical drive on page 27). 4. Remove the front bezel (Front bezel on page 20). 5. Rotate the drive cage to the upright position (Drive cage on page 22). Replace a memory module: 24 Chapter 4 Removal and replacement procedures

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NOTE:
The system does not operate properly if you install unsupported memory modules.
There are four memory sockets on the system board, with two sockets per channel. The sockets are labeled
DIMM1, DIMM2, DIMM3, and DIMM4. Sockets DIMM1 and DIMM2 operate in memory channel B. Sockets DIMM3
and DIMM4 operate in memory channel A.
The system automatically operates in single-channel mode, dual-channel mode, or
flex
mode, depending on
how the DIMMs are installed.
NOTE:
Single-channel and unbalanced dual-channel memory
configurations
results in inferior graphics
performance.
●
The system operates in single-channel mode if the DIMM sockets are populated in one channel only.
●
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 1 GB
DIMMs and channel B is populated with one 2 GB DIMM, the system will operate in dual-channel mode.
●
The system operates 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 2 GB DIMM, and three 1 GB DIMMs, channel A should be populated with the 2 GB DIMM
and one 1 GB DIMM, and channel B should be populated with the other two 1 GB DIMMs. With this
configuration,
4 GB runs 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 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 can 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, oxidation, or both 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, be sure that you are discharged of static electricity by
briefly
touching a grounded metal
object. For more information, see
Electrostatic discharge information
on page
10
.
When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the
module.
Before replacing the memory modules, follow these steps:
1.
Prepare the computer for disassembly (
Preparation for disassembly
on page
19
).
2.
Remove the access panel (
Access panel
on page
19
).
3.
Remove the optical drive (
Optical drive
on page
27
).
4.
Remove the front bezel (
Front bezel
on page
20
).
5.
Rotate the drive cage to the upright position (
Drive cage
on page
22
).
Replace a memory module:
24
Chapter 4
Removal and replacement procedures