Motherboard · medium

How to fixPCIE-BIFURCATION-ERROR

PCIe bifurcation error

What this error means

PCIe bifurcation error is a medium-severity motherboard issue. The motherboard incorrectly distributes the PCIe lines for the adapter (NVME RAID, PLX switch). It's also often linked to bifurcation disabled in BIOS. See the troubleshooting steps below for the fix.

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
01Turn on PCIe bifurcation in BIOS

Turn on PCIe bifurcation in BIOS.

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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02Check the board manual

Check the board manual.

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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03Verify slot support for bifurcation

Verify slot support for bifurcation.

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

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