Installing Additional Memory; Dimms; Ddr4-Sdram Dimms; Populating Dimm Sockets - HP ProDesk 400 G4 SFF Hardware Reference Manual

Installing additional memory

The computer comes with double data rate 4 synchronous dynamic random access memory (DDR4-SDRAM)
dual inline memory modules (DIMMs).

DIMMs

The memory sockets on the system board can be populated with up to two 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.

DDR4-SDRAM DIMMs

For proper system operation, the DIMMs must be:
Industry-standard 288-pin
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Unbuffered non-ECC PC4-17000 DDR4-2133 MHz-compliant
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1.2 volt DDR4-SDRAM DIMMs
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The DIMMs must also:
Support CAS latency 15 DDR4 2133 MHz (15-15-15 timing)
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Contain the mandatory JEDEC SPD information
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In addition, the computer supports:
512-MB, 1GB, and 2-GB non-ECC memory technologies
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Single-sided and double-sided DIMMs
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DIMMs constructed with x8 and x16 DDR devices; DIMMs constructed with x4 SDRAM are not supported
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NOTE: The system will not operate properly if you install unsupported DIMMs.

Populating DIMM sockets

There are two DIMM sockets on the system board, with one socket per channel. The sockets are labeled
DIMM1 and DIMM3. Socket DIMM1 operates in memory channel B. Socket DIMM3 operates 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 memory capacity of the DIMM
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in Channel A is equal to the memory capacity of the DIMM in Channel B.
The system will operate in flex mode if the memory capacity of the DIMM in Channel A is not equal to the
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memory capacity of the DIMM 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
Installing additional memory 11