B580 eGPU Functionality and Rebar Support Issues

[NkArc]

Hello Intel,

I received my B580 yesterday to get some additional performance for my current desktop; I managed to set up an  External GPU rig with an 800W power supply that connects to my PC via Thunderbolt-4, which has a bandwidth around 40-Gbps. That said, there have been some performance issues with this card.

For starters, even though my motherboard and BIOS have Resizeable Bar and 4G enabled by default (I went ahead and double checked, and even reset my device just in case), the Intel Arc drivers weren't able to detect the Resizeable Bar, giving me the red "X Resizeable Bar" sign on the Intel Graphics Software. My GPU-Z stats also show that the GPU is not detecting the Rebar as well:

The performance of the card doesn't seem to be utilized to 10% of the card's capabilities. Running a game such as Tekken 8, I was only able to get around 45 fps on low with AI upscaling set to XeSS Performance while running this game at 1440p. 

I'm not expecting the GPU to be fully utilized due to restrictions due to my bandwidth, but even then, the current performance is lower compared to my integrated graphics. Could it be possible that the current Intel graphics drivers do not support Rebar via Thunderbolt-4 at the moment?

[JedG_Intel]

Hi NkArc,

Thank you for posting on Intel Community Forum.

I understand that you're experiencing functionality issues with B580 via Thunderbolt-4. Please share the information below for me to address this correctly.

1. Have you tried connecting the GPU directly without using Thunderbolt connection?

2. Are you using an All-In-One computer or laptop?

Additionally, to better understand your system's configuration, we kindly request that you download the Intel® System Support Utility for Windows* software. You can find the download link here: Intel® System Support Utility for Windows*

I look forward to your response.

Best regards,

Jed G.

Intel Customer Support Technician

[DhannielM_Intel]

Hi NkArc,

I hope you're doing well. I'm following up to see if you've had a chance to review the questions I posted. Please let me know at your earliest convenience so we can determine the next steps to resolve this matter.

Best regards,

Dhanniel M.

Intel Customer Support Technician

[JedG_Intel]

Hello NkArc,

I have not heard back from you so I will close this inquiry now. If you need further assistance, please submit a new question as this thread will no longer be monitored.

Best regards,

Jed G.

Intel Customer Support Technician

[Jacksofclubs]

I believe he may have given up on the issue. Honestly, my 1070 Ti outperforms the B580 when used with my Thunderbolt 4 eGPU dock. After researching online, I found mixed reviews—some call the B580 terrible, while others praise it. I really want to get it working with my eGPU Thunderbolt Dock, so I can use my high-end system as my primary setup instead of relying on my server PC. I’ve been searching for software to enable Resizable BAR on the thunderbolt for intel GPUs, as it seems this feature is critical for compatibility.

I feel its been a while since the Arc B580, all the kinks should have work arounds. I am stuck with the card since i purchased while out of town and just found some free time to relax. Is there software or even hardware besides purchasing a brand new GPU i can do the get resizable bar to work through the thunderbolt 4?  Maybe a thunderbolt accessory. i think there is a market that both intel and intel consumers could profit from this, or future opportunies.