Memory · medium

How to fixRAM-DUAL-CHANNEL-FAIL

RAM dual channel mode failure

What this error means

RAM dual channel mode failure (RAM-DUAL-CHANNEL-FAIL) is a medium-severity fault affecting the system memory (RAM). The system is operating in single-channel memory mode instead of the expected dual-channel configuration. Dual-channel mode doubles the effective memory bandwidth by using two RAM channels simultaneously. Operating in single-channel can reduce performance by 15-30% in memory-intensive tasks and can cause instability in some configurations. Typical causes include RAM modules inserted in wrong DIMM slots and one RAM module failed. The steps below are ordered to resolve this efficiently.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Reinstall RAM in correct dual-channel slots (A2+B2)

Reinstall RAM in correct dual-channel slots (A2+B2).

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Test each RAM stick individually

Test each RAM stick individually.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Check motherboard manual for correct slot positions

Check motherboard manual for correct slot positions.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • RAM modules inserted in wrong DIMM slots
  • One RAM module failed
  • BIOS memory channel configuration error

Useful Windows tools

These commands open Windows tools. Review any action inside the tool before applying changes.

msinfo32