Motherboard · medium

How to fix PCIe bifurcation error

Motherboard troubleshooting guide

What this error means

The motherboard incorrectly distributes the PCIe lines for the adapter (NVME RAID, PLX switch). It's also often linked to bifurcation disabled in BIOS.

Updated

Before you begin

Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.

Work through these checks

0 of 3 complete
01Turn on PCIe bifurcation in BIOS
  1. Turn on PCIe bifurcation in BIOS
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

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02Check the board manual
  1. Check the board manual
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
03Verify slot support for bifurcation
  1. Verify slot support for bifurcation
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors

Possible causes

  • Bifurcation disabled in BIOS
  • The adapter requires a x4x4 bifurcation
  • The board does not support bifurcation