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 complete01Move the SSD to the M.2 slot directly on the CPU (labeled CPU_M.2 or PCIe Gen4x4)
- Move the SSD to the M.2 slot directly on the CPU (labeled CPU_M.2 or PCIe Gen4x4)
What to expect
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
02Check the board manual which slots share the PCIe lines
- Check the board manual which slots share the PCIe lines
What to expect
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
03Check the speed in CrystalDiskMark
- Check the speed in CrystalDiskMark
What to expect
Check whether the original symptom still occurs.
If it does not helpContinue only if this check applies to your device. Consult its manufacturer if you are unsure.
Possible causes
- The GPU in the primary slot takes the PCIe lines from the M.2 slot
- Chipset M.2 port limitation (PCH vs CPU lanes)
- Incorrect PCIe Bifurcation setting in BIOS
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