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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 64 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 PC4-19200 DDR4-2400 MHz-compliant
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1.2 volt DDR4-SDRAM memory modules
CAS latency 17 DDR4 2400 MHz (17-17-17 timing)
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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 x8 and x16 DDR devices; memory modules constructed with x4 SDRAM
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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 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
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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
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Chapter 4 Removal and replacement procedures
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