Compaq 315eu Maintenance and Service Guide - Compaq 100eu Small Form Factor, 1 - Page 57

Populating DIMM Sockets, DIMM Socket Locations

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● 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. Populating DIMM Sockets There are four DIMM sockets on the system board, with two sockets per channel. DIMM Socket Locations When installing memory modules: ● If installing only one memory module, install it in DIMM4. ● If installing 2 memory modules: ◦ 2 matching memory modules - install in DIMM4 and DIMM3. ◦ 2 non-matching memory modules - install in DIMM4 and DIMM3. Install the larger (GB) module in DIMM4 and smaller (MB) module in DIMM3. Figure 6-3 DIMM Socket Locations Memory 47

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●
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.
Populating DIMM Sockets
There are four DIMM sockets on the system board, with two sockets per channel.
DIMM Socket Locations
When installing memory modules:
●
If installing only one memory module, install it in DIMM4.
●
If installing 2 memory modules:
◦
2 matching memory modules - install in DIMM4 and DIMM3.
◦
2 non-matching memory modules - install in DIMM4 and DIMM3. Install the larger (GB)
module in DIMM4 and smaller (MB) module in DIMM3.
Figure 6-3
DIMM Socket Locations
Memory
47