HP Pro Mini 400 G9 Desktop PC Maintenance and Service Guide - Page 30

The system automatically operates in single-channel mode, dual-channel mode, or flex mode

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There are two SODIMM sockets on the system board, with one socket per channel. The sockets are labeled DIMM1 and DIMM3. The DIMM1 socket operates in memory channel B. The DIMM3 socket operates in memory channel A. The computer comes with double data rate 3 synchronous dynamic random access memory (DDR4-SDRAM) small outline dual inline memory modules (SODIMMs). IMPORTANT: You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules. Regardless of the power state, voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing memory modules while voltage is present can cause irreparable damage to the memory modules or system board. IMPORTANT: When handling a memory module, be careful not to touch any of the contacts. Doing so can damage the module. The memory module sockets have gold-plated metal contacts. When upgrading the memory, use memory modules with gold-plated metal contacts to prevent corrosion, oxidation, or both, resulting from having incompatible metals in contact with each other. Static electricity can damage the electronic components of the computer or optional cards. Before beginning these procedures, be sure that you are discharged of static electricity by briefly touching a grounded metal object. NOTE: System board appearance can vary. The system automatically operates in single-channel mode, dual-channel mode, or flex mode, depending on how the SODIMMs are installed. ● The system operates in single-channel mode if the SODIMM sockets are populated in one channel only. ● The system operates in a higher-performing dual-channel mode if the memory capacity of the SODIMM in channel A is equal to the memory capacity of the SODIMM in channel B. ● The system operates in flex mode if the memory capacity of the SODIMM in channel A is not equal to the memory capacity of the SODIMM 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. If one channel has more memory than the other, assign the larger amount to channel A. Memory modules (SODIMMs) 23

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There are two SODIMM sockets on the system board, with one socket per channel. The sockets are labeled
DIMM1 and DIMM3. The DIMM1 socket operates in memory channel B. The DIMM3 socket operates in memory
channel A.
The computer comes with double data rate 3 synchronous dynamic random access memory (DDR4-SDRAM)
small outline dual inline memory modules (SODIMMs).
IMPORTANT:
You must disconnect the power cord and wait approximately 30 seconds for the power to
drain before adding or removing memory modules. Regardless of the power state, voltage is always supplied
to the memory modules as long as the computer is plugged into an active AC outlet. Adding or removing
memory modules while voltage is present can cause irreparable damage to the memory modules or system
board.
IMPORTANT:
When handling a memory module, be careful not to touch any of the contacts. Doing so can
damage the module.
The memory module sockets have gold-plated metal contacts. When upgrading the memory, use memory
modules with gold-plated metal contacts to prevent corrosion, oxidation, or both, resulting from having
incompatible metals in contact with each other.
Static electricity can damage the electronic components of the computer or optional cards. Before beginning
these procedures, be sure that you are discharged of static electricity by briefly touching a grounded metal
object.
NOTE:
System board appearance can vary.
The system automatically operates in single-channel mode, dual-channel mode, or flex mode, depending on
how the SODIMMs are installed.
●
The system operates in single-channel mode if the SODIMM sockets are populated in one channel only.
●
The system operates in a higher-performing dual-channel mode if the memory capacity of the SODIMM in
channel A is equal to the memory capacity of the SODIMM in channel B.
●
The system operates in flex mode if the memory capacity of the SODIMM in channel A is not equal to
the memory capacity of the SODIMM 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. If one channel has more memory than the other, assign the larger amount to
channel A.
Memory modules (SODIMMs)
23