HP EliteDesk 705 G2 Hardware Reference Guide - Page 19

Installing additional memory, DIMMs, DDR3/DDR3L-SDRAM DIMMs, Populating DIMM sockets

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Installing additional memory The computer comes with low power double data rate 3 synchronous dynamic random access memory (DDR3L-SDRAM) dual inline memory modules (DIMMs). It also supports standard DDR3-SDRAM DIMMS. DIMMs The memory sockets on the system board can be populated with up to four industry-standard DIMMs. These memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum memory support, you can populate the system board with up to 32-GB of memory configured in a high-performing dual channel mode. DDR3/DDR3L-SDRAM DIMMs For proper system operation, the DIMMs must be: ● industry-standard 240-pin ● unbuffered non-ECC PC3-12800 DDR3/DDR3L-1600 MHz-compliant ● 1.5 volt DDR3-SDRAM DIMMs or 1.35 volt DDR3L-SDRAM (Low Power) DIMMs The DIMMs must also: ● support CAS latency 11 DDR3/DDR3L 1600 MHz (11-11-11 timing) ● contain the mandatory JEDEC SPD information In addition, the computer supports: ● 512-Mbit, 1-Gbit, and 2-Gbit non-ECC memory technologies ● single-sided and double-sided DIMMs ● DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported NOTE: The system will not operate properly if you install unsupported DIMMs. Populating DIMM sockets There are four DIMM 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 will automatically operate 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 will result in inferior graphics performance. ● The system will operate 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 will operate 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 Installing additional memory 13

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Installing additional memory
The computer comes with low power double data rate 3 synchronous dynamic random access memory
(DDR3L-SDRAM) dual inline memory modules (DIMMs). It also supports standard DDR3-SDRAM DIMMS.
DIMMs
The memory sockets on the system board can be populated with up to four industry-standard DIMMs. These
memory sockets are populated with at least one preinstalled DIMM. To achieve the maximum memory
support, you can populate the system board with up to 32-GB of memory configured in a high-performing
dual channel mode.
DDR3/DDR3L-SDRAM DIMMs
For proper system operation, the DIMMs must be:
●
industry-standard 240-pin
●
unbuffered non-ECC PC3-12800 DDR3/DDR3L-1600 MHz-compliant
●
1.5 volt DDR3-SDRAM DIMMs or 1.35 volt DDR3L-SDRAM (Low Power) DIMMs
The DIMMs must also:
●
support CAS latency 11 DDR3/DDR3L 1600 MHz (11-11-11 timing)
●
contain the mandatory JEDEC SPD information
In addition, the computer supports:
●
512-Mbit, 1-Gbit, and 2-Gbit non-ECC memory technologies
●
single-sided and double-sided DIMMs
●
DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported
NOTE:
The system will not operate properly if you install unsupported DIMMs.
Populating DIMM sockets
There are four DIMM 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 will automatically operate 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 will result in inferior graphics
performance.
●
The system will operate 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 will operate 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
Installing additional memory
13