HP ProDesk 480 G7 PCI Micro Maintenance and Service Guide - Page 42

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

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● CAS latency 17 DDR4 2400/2666 MHz (17-17-17 timing) ● Mandatory JEDEC SPD information The computer supports the following setups: ● 512 Mbit, 1 Gbit, 2 Gbit, and 4 Gbit non-ECC memory technologies ● Single-sided and double-sided memory modules ● Memory modules constructed with ×8 and ×16 DDR devices; memory modules constructed with ×4 SDRAM are not supported 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 result 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 12. When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the module. 34 Chapter 4 Removal and replacement procedures ENWW

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●
CAS latency 17 DDR4 2400/2666 MHz (17-17-17 timing)
●
Mandatory JEDEC SPD information
The computer supports the following setups:
●
512 Mbit, 1 Gbit, 2 Gbit, and 4 Gbit non-ECC memory technologies
●
Single-sided and double-sided memory modules
●
Memory modules constructed with ×8 and ×16 DDR devices; memory modules constructed with ×4 SDRAM
are not supported
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 result 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
12
.
When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the module.
34
Chapter 4
Removal and replacement procedures
ENWW