BIOS & startup · medium

How to fix Insufficient space in Option ROM BIOS

Error code: ROM-SPACE-EXHAUSTED

What this error means

The board has too many associated devices with custom ROMs (eg RAID controllers, multiple GPUs) and has run out of space to initialize them (POST). Another common trigger is active Legacy and CSM boot modes.

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 off CSM (Compatibility Support Module) and go to pure UEFI
  1. Turn off CSM (Compatibility Support Module) and go to pure UEFI
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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02Disable unused integrated components (COM ports, internal SATA RAID)
  1. Disable unused integrated components (COM ports, internal SATA RAID)
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
03Disconnect unnecessary expansion cards
  1. Disconnect unnecessary expansion cards
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

  • Too many PCIe expansion cards plugged in
  • Old board architecture with small ROM for BIOS
  • Active Legacy and CSM boot modes