The memory configuration information in this document applies to the Intel® Desktop Boards listed below.

Dual Channel memory configurations will provide increased performance over Single Channel configurations. Follow the guidelines below when configuring your system memory to provide the best possible performance for your system.

Memory Configuration for Dual Channel Mode

Two or Four DIMMs - Populated Symmetrically

You will get Dual Channel Mode if you populate the memory slots with two or four identical symmetrical DIMMs, such as in these examples:

Rules to Enable Dual Channel Mode
To achieve Dual Channel mode, the following conditions must be met:

• Matched DIMM configuration in each channel
• Same Density (128MB, 256MB, 512MB, etc.)
• Same DRAM technology (128Mb, 256Mb, or 512Mb)
• Same DRAM bus width (x8 or x16)
• All either single-sided or dual-sided
• Matched in both Channel A and Channel B memory channels
• Populate symmetrical memory slots (Slot 0 or Slot 1)

• Same brand
• Same timing specifications
• Same DDR speed

Note: Memory channel speed is determined by the slowest DIMM module populated in the system.

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Memory Configuration for Single Channel Mode

You will get Single Channel Mode if you populate memory modules only into single channels, such as in these examples:

You will get Single Channel Mode if you populate memory modules non-symmetrically, such as in these examples:

You will get Single Channel Mode if you populate with non-identical DIMMs, such as in these examples:

Note: Memory channel speed is determined by the slowest DIMM module populated in the system.

BIOS Settings
The BIOS setup Main screen will display Memory Mode information, as follows:

This applies to:

Intel® Desktop Board D865GBF Intel® Desktop Board D865GLC Intel® Desktop Board D865GRH Intel® Desktop Board D865PERL Intel® Desktop Board D875PBZ Intel® Desktop Board D915PDT