HP Pro 2110 Small Form Factor Maintenance & Service Manual page 56

For proper system operation, the DDR3-SDRAM DIMMs must be:
industry-standard 240-pin
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unbuffered non-ECC PC3-10600 DDR3-1333 MHz-compliant
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1.5 volt DDR3-SDRAM DIMMs
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The DDR3-SDRAM DIMMs must also:
support CAS latency 9 DDR3 1333 MHz (9-9-9 timing)
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contain the mandatory JEDEC SPD information
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In addition, the computer supports:
512-Mbit, 1-Gbit, and 2-Gbit 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
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supported
NOTE:
The system will not operate properly if you install unsupported DIMMs.
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
The system will operate in single channel mode if the DIMM sockets are populated in one channel
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only.
The system will operate in a higher-performing dual channel mode if the total memory capacity of
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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 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 DIMM, and Channel B should
be populated with the two 1-GB DIMMs. With this configuration, 4 GB will run as dual channel
and 1 GB will run as single channel.
In any mode, the maximum operational speed is determined by the slowest DIMM in the system.
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46 Chapter 5 Removal and Replacement Procedures Minitower (MT) Chassis