DRAM Bus Selection – The BIOS Optimization Guide

DRAM Bus Selection - The BIOS Optimization Guide

DRAM Bus Selection

Common Options : Auto, Single Channel, Dual Channel

 

Quick Review

The DRAM Bus Selection BIOS feature allows you to manually set the functionality of the dual channel feature. By default, it’s set to Auto. However, it is recommended that you manually select either Single Channel or Dual Channel.

If you are only using a single memory module; or your memory modules are installed on the same channel, you should select Single Channel. You should also select Single Channel, if your memory modules do not function properly in dual channel mode.

If you have at least one memory module installed on both memory channels, you should select Dual Channel for improved bandwidth and reduced latency. But if your system does not function properly after doing so, your memory modules may not be able to support dual channel transfers. If so, set it back to Single Channel.

 

Details

Many motherboards now come with dual memory channels. Each channel can be accessed by the memory controller concurrently, thereby improving memory throughput, as well as reducing memory latency.

Depending on the chipset and motherboard design, each memory channel may support one or more DIMM slots. But for the dual channel feature to be work properly, at least one DIMM slot from each memory channel must be filled.

The DRAM Bus Selection BIOS feature allows you to manually set the functionality of the dual channel feature. By default, it’s set to Auto. However, it is recommended that you manually select either Single Channel or Dual Channel.

If you are only using a single memory module; or your memory modules are installed on the same channel, you should select Single Channel. You should also select Single Channel, if your memory modules do not function properly in dual channel mode.

If you have at least one memory module installed on both memory channels, you should select Dual Channel for improved bandwidth and reduced latency. But if your system does not function properly after doing so, your memory modules may not be able to support dual channel transfers. If so, set it back to Single Channel.

 

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3 Comments

    1. Dr. Adrian Wong

      In some cases (when the memory is overclocked, for example), the motherboard may not accurately detect the presence of dual-channel memory and default to single-channel. That would reduce performance.

      Reply
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