Intel Arc B580 stuck at PCIe 4.0 x1 instead of x8 on Gigabyte B550M DS3H

[Tumsfestival]

Hello, sorry for bothering you. I have a problem with Intel Arc B580 GPU. The card is running at PCIe 4.0 x1 instead of its intended x8 mode, which is probably bottlenecking its performance.

Monitoring tools (CPU-Z, GPU-Z with Render) consistently show that the GPU is running at PCIe 4.0 x1.

• Current Link Width: x1

• Max Supported: x8

• Link Speed: 16.0 GT/s (PCIe 4.0)

Everything I Have Already Tried:

1. BIOS Update: Updated the motherboard BIOS to the latest available version. (f20h now)

2. BIOS Settings:

   • Enabled Above 4G Decoding.

   • Set the PCIe slot speed to Gen4 

   • Loaded Optimized Defaults and reconfigured settings multiple times.

3. Physical Re-seating: Completely powered down the system, removed the GPU, and re-seated it firmly into the PCIe x16 slot.

4. Clean Driver Installation: Used DDU (Display Driver Uninstaller) in Safe Mode to wipe all previous GPU drivers and performed a clean install of the latest Intel drivers.

5. Hardware Conflict Check: I do not have any other PCIe devices (Wi-Fi cards, M.2 drives in secondary slots) that could be consuming PCIe lanes. The GPU is the only add-in card.

Is there any solution or i misunderstood situation? Thanks.

[RandyT_Intel]

Hi @Tumsfestival,

Thank you for posting here in our community. Due to the PCIe hierarchy of the Intel® Arc™ Graphics Cards, standard operating system tools such as the Windows* Device Manager and the Linux* console lspci command, will not show the device’s actual PCIe port speed (specifically the PCI max link speed and PCI max link width) information of the graphics device properly. They will always show Gen1 and x1 lanes instead of the expected product information, for example such as Gen4 and x16 lanes for the Intel® Arc™ A770 Graphics card.

Why Is My System Reporting PCIe Gen 1x1 Instead of the Actual PCIe...

Best regards, 

Randy T. 

Intel Customer Support Technician 

[Tumsfestival]

Sorry, sir, but it's not true. 

I solved the problem myself. You need to update the BIOS to the latest version, then turn off the PC, turn off the power supply with a button, and remove the CMOS battery. Wait for a while. It took me half an hour, but I've seen reports of guys being taken out at night.

Insert the battery, turn on the PSU, turn on the PC. You should see a message that the BIOS settings have been reset. Personally, I updated a couple of parameters, for example, I installed PCIe Gen 4 and enabled Above 4G Decoding.

The problem, by the way, does not happen only on Intel, as explained by the search.

So that you understand. When there was one PCIe line, the FPS in Path of Exile 2 was 39. I had to turn on the zoom for ultra performance, the game looked terrible. After I did the procedures described above and opened 8 lines, FPS became 91. Without zooming with maximum settings. Even with shadows.

Good luck to everyone.

[RandyT_Intel]

Hi @Tumsfestival,

Glad to hear the issue has been resolved! The article I shared remains a solid reference, though I didn’t initially suggest updating the BIOS since you had already done so. It appears that resetting the BIOS settings by reseating the CMOS battery helped resolve the PCIe lane detection issue, which is a valuable insight that could benefit other users experiencing similar problems.

Regarding the performance improvement you mentioned in Path of Exile 2, we recommend submitting a separate thread for that concern. This will help us better assist you with the specifics and keep our responses organized.

Since the original issue is now resolved, I’ll go ahead and close this thread. It will no longer be monitored, but feel free to post a new thread if you encounter any issues in the future.

Best regards, 

Randy T. 

Intel Customer Support Technician