HP EliteDesk 800 G5 Maintenance and Service Guide - Page 34

Memory, Populating DIMM sockets, DIMM1

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Memory The computer comes with double data rate 4 synchronous dynamic random access memory (DDR4-SDRAM) dual inline memory modules (DIMMs). The memory sockets on the system board are populated with at least one preinstalled memory module. To achieve the maximum memory support, you can populate the system board with up to 128 GB of memory configured in a high-performing dual-channel mode. The maximum single-module memory capacity is 32 GB. For proper system operation, the DIMMs must adhere to the following specifications: ● Industry-standard 288-pin ● Unbuffered non-ECC PC4-21300 DDR4-2666 MHz-compliant ● 1.2 V DDR4-SDRAM memory modules ● CAS latency 19 DDR4 2666 MHz ● Mandatory JEDEC SPD information The computer supports the following memory types: ● 512 Mb, 1 Gb, 2 Gb, 4 Gb, 8 Gb, and 16 Gb 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. Populating DIMM sockets 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 operates 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 operates in dual-channel mode. NOTE: When using two memory modules, both DIMM memory module part numbers must be identical to set memory speed to max performance mode (2666MHz). ● 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 has more memory than the other, the larger amount is 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- 24 Chapter 4 Removal and replacement procedures

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Memory
The computer comes with double data rate 4 synchronous dynamic random access memory (DDR4-SDRAM)
dual inline memory modules (DIMMs).
The memory sockets on the system board are populated with at least one preinstalled memory module. To
achieve the maximum memory support, you can populate the system board with up to 128 GB of memory
configured in a high-performing dual-channel mode. The maximum single-module memory capacity is 32 GB.
For proper system operation, the DIMMs must adhere to the following specifications:
●
Industry-standard 288-pin
●
Unbuffered non-ECC PC4-21300 DDR4-2666 MHz-compliant
●
1.2 V DDR4-SDRAM memory modules
●
CAS latency 19 DDR4 2666 MHz
●
Mandatory JEDEC SPD information
The computer supports the following memory types:
●
512 Mb, 1 Gb, 2 Gb, 4 Gb, 8 Gb, and 16 Gb 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.
Populating DIMM sockets
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 operates 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 operates in dual-channel mode.
NOTE:
When using two memory modules, both DIMM memory module part numbers must be identical
to set memory speed to max performance mode (2666MHz).
●
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 has more memory than the
other, the larger amount is 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-
24
Chapter 4
Removal and replacement procedures