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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?
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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
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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
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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

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