topic Re: Resize bar in my bios only has "disabled"or "Auto" settings. ARC 580 won't r in Intel® Arc™ Discrete Graphics

Resize bar in my bios only has "disabled"or "Auto" settings. ARC 580 won't recognize it . Gigabyte

John85 — Mon, 22 Dec 2025 20:16:40 GMT

Resize bar in my bios only has "disabled"or "Auto" settings. ARC 580 won't recognize it . Gigabyte

B450 Aorus pro wifi socket A4 with latest bios installed. Any suggestions?

Re: Resize bar in my bios only has "disabled"or "Auto" settings. ARC 580 won't r

RandyT_Intel — Tue, 23 Dec 2025 05:29:09 GMT

Thank you for posting in the community. On Gigabyte motherboards, Re‑Size BAR = Auto is the intended setting; there typically isn’t a manual “Enabled” option. Whether ReBAR becomes active depends on several prerequisites, including:

UEFI boot mode
CSM disabled
Above 4G Decoding enabled
Supported CPU
Correct BIOS version

If any of these conditions are missing, the GPU or drivers will report ReBAR as disabled even though the BIOS shows “Auto.”

Gigabyte added ReBAR support to 400‑series chipsets through BIOS updates (for B450, version F60 or later). Your B450 AORUS Pro WiFi should support it once the correct BIOS is installed and settings are properly configured.

Common pitfalls:

CPU compatibility issues
CSM being re‑enabled unexpectedly
Missing Above 4G Decoding setting (ReBAR will not engage even on “Auto”)

For further investigation, please provide:

Your CPU model
The exact BIOS version currently installed
Whether Windows is running in UEFI/GPT mode (we can check this quickly)
Please provide the SSU log report and share it here so I can review your system's configuration.

Once I have this information, I’ll help you pinpoint the blocker it’s usually one of the above.

Looking forward to your response!

Best regards,

Randy T.

Intel Customer Technician

Re:Resize bar in my bios only has "disabled"or "Auto" settings. ARC 580 won't recognize it . Gigabyte

RandyT_Intel — Tue, 30 Dec 2025 00:39:03 GMT

Hi @John85,

I'm following up to see if you've had a chance to review the information and requested details from my previous post. Please let me know so I can determine the best next steps.

Looking forward to your update.

Best regards,

Randy T.

Intel Customer Support Technician

Re:Resize bar in my bios only has "disabled"or "Auto" settings. ARC 580 won't recognize it . Gigabyte

RandyT_Intel — Mon, 05 Jan 2026 09:01:58 GMT

Hi @John85,

Since I haven't heard back from you, I will be closing this thread.

If you need further assistance, please submit a new thread or post a new issue in our community.

Thank you.

Best regards,

Randy T.

Intel Customer Support Technician