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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.
For proper system operation, the DIMMs must adhere to the following specifications:
Industry-standard 288-pin
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Unbuffered non-ECC PC4-21300 DDR4-2666 MHz or PC4-25600 DDR4-3200 MHz (select products only)
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1.2 V DDR4-SDRAM memory modules
CAS latency 17 DDR4 2666 (17-17-17 timing) or DDR4-3200 (17-17-17 timing) (select products only)
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Mandatory JEDEC SPD information
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The computer supports the following:
512 Mb, 1 Gb, 2 Gb, and 4 Gb non-ECC memory technologies
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Single-sided and double-sided memory modules
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Memory modules constructed with ×8 and ×16 DDR devices; memory modules constructed with ×4
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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 DIMM3 operate in memory channel B. Sockets DIMM2
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.
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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 operates 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
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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, assign the larger amount to Channel A. For example, if you are populating the sockets with
one 2 GB DIMM, and three 1 GB DIMMs, populate Channel A with the 2 GB DIMM and one 1 GB DIMM, and
populate Channel B with the other two 1 GB DIMMs. With this configuration, 4 GB runs as dual channel
and 1 GB runs as single channel.
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Chapter 4 Removal and replacement procedures
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