Insufficient space in Option ROM BIOS

What is ROM-SPACE-EXHAUSTED?

The ROM-SPACE-EXHAUSTED error is categorized as a medium-severity hardware BIOS/UEFI issue that can significantly impact your PC's stability. 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). When experiencing the Insufficient space in Option ROM BIOS fault, users often report sudden system crashes, unresponsive behavior, or a blue screen of death (BSOD). In most diagnostic scenarios, this problem is directly triggered by underlying hardware or software complications such as too many pcie expansion cards plugged in, old board architecture with small rom for bios and active legacy and csm boot modes. To permanently resolve the ROM-SPACE-EXHAUSTED issue and prevent further system degradation, it is highly recommended to follow our step-by-step troubleshooting guide below, ensuring your hardware BIOS/UEFI components are functioning correctly.

Common Causes

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

Step-by-Step Fix Guide

• 1
  Turn off CSM (Compatibility Support Module) and go to pure UEFI

  Applying the first fix (Turn off CSM (Compatibility Support Module) and go to pure UEFI) addresses the most common root cause of ROM-SPACE-EXHAUSTED and restores baseline functionality.

• 2
  Disable unused integrated components (COM ports, internal SATA RAID)

  If the problem persists, proceeding with the remaining steps ensures all edge cases related to bios instability are covered.

• 3
  Disconnect unnecessary expansion cards