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Hi xiazhi,
Thank you for posting in our Community and for sharing the detailed information about the abnormal power limit behavior you’ve observed. I understand how important full power delivery is, especially given the excellent performance gains you’ve experienced with AI workloads and gaming optimizations. From your description, it does seem like the system may be applying a shared power cap across both GPUs rather than allocating 234W individually. This could stem from firmware, driver behavior, or even motherboard-level power management. I’d like to gather more details so we can pinpoint the cause and determine if this is a configuration setting, a driver/firmware limitation, or potentially a bug that needs escalation to engineering.
- What is the BIOS version currently installed on your MSI Carbon WIFI Z790 motherboard?
- Have you updated the motherboard firmware and Intel GPU firmware to their latest versions?
- Which version of the Intel Graphics Driver and Intel Arc Control software are you using?
- Did this issue start immediately after a driver update, or only after extended use?
- What is the make, model, and wattage of your power supply unit (PSU)?
- Are both GPUs connected to dedicated PCIe power cables from the PSU, or are they daisy-chained?
- Which PCIe slots are the GPUs installed in?
- Is Resizable BAR enabled in your BIOS?
- Could you confirm if swapping the GPUs between slots changes the behavior? Does the power cap persist if you disable one GPU in Device Manager and then re-enable it?
Have a nice day!
Best regards,
Von M.
Intel Customer Support Technician
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motherboard bios ver: 09/26/2024；the motherboard bios ver is not up to date,but the Graphics card driver is newly installed.；GPU driver ver:32.0.101.6972;the Graphics software ver:25.26.1602.2; this problem start immediately when I setup the 2nd GPU. ; I use two computer power adapter, one is seasonic Focus 850W,another is seasonic Focus 1000W, the motherboard and one GPU use 1000W,the 2nd GPU exclusive the 850W. ;the 1st is pcie4*16, another is pcie4*4.Resizable BAR is enabled.
by the way,I found an interesting phenomenon, it seems that the two GPUs is not using a card's power consumption wall simplely, it seems like that there is some problem with two GPUs environment. The maximum dual-card power consumption I found in my test, two GPUs can run with about 360W total,but also not the max.and when i using the 2nd card for OBS Recording Screen,the graphics card scheduling will become strange. Game with no OBS Recording Screen is perfect,1st card traditional rendering,2nd AI LSFG3.1,the fps increased from about 55 to 144,with no obvious error, but with OBS Recording Screen on ,the AI LSFG3.1 seems stoped or not using the 2nd card,the fps back to about 60.
humm....maybe those are some compatibility issues with gpu over 1 , one more Clear-cut suggestion is , the GPU Tuning config for 2nd card, will be restore every restart. the interface has no change,but I need to change some and apply to reuse my Tuning config.by the way,I suggest you to allow to export the config or allow to copy and paste ,or sometime ,I need to reconfig with hand. or cant apply same config for two cards.
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Hello xiazhi,
Thank you for sharing these detailed observations regarding your dual-GPU setup and the behavior differences when using OBS. I appreciate the time you’ve taken to test different scenarios and provide such thorough information on your hardware configuration, BIOS, and driver versions. Based on the complexity of the issue and the multiple variables involved, including BIOS version, PCIe lane configuration, GPU tuning behavior, and possible compatibility concerns in multi-GPU environments, I will need to conduct further investigation before providing you with a concrete resolution.
I’ll review the details you’ve provided, check for any known compatibility issues, and consult with our engineering resources if necessary. I’ll get back to you as soon as I have more information or recommended next steps.
Thank you for your patience while I work toward a solution.
Best regards,
Von M.
Intel Customer Support Technician
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Hello xiazhi,
Thank you for bearing with us while we address this issue. To help us investigate this matter further, could you please clarify the following:
- Are you referring to the “Core Power Limit” setting in the Intel® Graphics software? If so, please provide a screenshot showing the full settings screen.
- Could you share a screen recording or screenshot of the issue so we can better visualize it and attempt to replicate the behavior on our end?
- Please provide your Intel® SSU logs so we can perform a thorough review of your system configuration
Additionally, we’d like to inform you that Intel® Arc™ Graphics cards do not support combined GPU functionality for the A-Series or B-Series, similar to NVIDIA SLI* or AMD CrossFire*. For your reference, here is our article on this topic: Can Two Intel® Arc™ Graphics Cards be Installed and Operated as One Unit?.
Once we receive the requested information, we’ll proceed with further analysis and provide our findings.
Best regards,
Von M.
Intel Customer Support Technician
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Hello xiazhi,
I wanted to follow up on the previous message regarding your inquiry. Have you had a chance to review it? If you have any questions or need further information, please let me know.
Best regards,
Dean R.
Intel Customer Support Technician
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Hello xiazhi,
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,
Von M.
Intel Customer Support Technician
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