Populating Dimm Sockets - HP Pro 3330 Maintenance And Service Manual

For proper system operation, the DDR3-SDRAM DIMMs must be:
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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
The DDR3-SDRAM DIMMs must also:
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support CAS latency 9 DDR3 1333 MHz (9-9-9 timing)
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contain the mandatory JEDEC SPD information
In addition, the computer supports:
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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
supported
NOTE: The system will not operate properly if you install unsupported DIMMs.

Populating DIMM Sockets

Populate the DIMM sockets in the following order: XMM1, XMM3
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
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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. If Channel A is populated with
one 1-GB DIMM 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. If you are populating the sockets with one 2-GB DIMM, and one 1-GB DIMM,
Channel A should be populated with the 2-GB DIMM, and Channel B should be populated with
the 1-GB DIMM. With this configuration, 2 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.
The system will automatically operate in single channel mode, dual channel mode, or flex mode,
depending on how the DIMMs are installed.
48 Chapter 7 Removal and Replacement Procedures – Microtower (MT) Chassis