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support/windows-server/shell-experience/network-adapters-inaccurate-link-speed.md

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---
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title: High-Speed Network Adapters Show Inaccurate Link Speed
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title: High-Speed Network Adapters Show Inaccurate Link Speeds
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description: Describes a limitation in Windows user interfaces where the link speed might not be displayed correctly for high-speed network adapters.
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ms.date: 06/13/2025
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ms.date: 06/16/2025
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manager: dcscontentpm
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audience: itpro
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ms.topic: troubleshooting
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- sap:windows desktop and shell experience\file explorer (app only,folders,quick access,file explorer search)
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- pcy:WinComm User Experience
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# High-speed network adapters show inaccurate link speed
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# High-speed network adapters show inaccurate link speeds
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This article describes a limitation in Windows user interfaces where the link speed might not be displayed correctly for high-speed network adapters.
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On devices using high-speed network adapters (for example, 400 Gbps or higher), the link speed displayed in Windows user interfaces like Network Connections (**ncpa.cpl**) might appear lower than the actual configured speed.
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On devices using high-speed network adapters (for example, 400 Gbps or higher), the link speed displayed in Windows user interfaces like Network Connections (**ncpa.cpl**) might be lower than the actual configured speed.
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For example, you might observe a displayed speed of 170.5 Gbps even though the hardware is correctly configured for 600 Gbps.
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## The link speed exceeds the representable range
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This issue is due to a limitation in how certain legacy components query and report link speed information.
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Specifically, the Windows user interface retrieves the link speed using a method that returns the result as a 32-bit value, measured in 100-bps units. If the actual link speed exceeds approximately 429.5 Gbps, the value might exceed the representable range and appear truncated in the display.
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Specifically, the Windows user interface retrieves the link speed using a method that returns the result as a 32-bit value, measured in 100-bps units. If the actual link speed exceeds approximately 429.5 Gbps, the value might exceed the representable range and be truncated in the display.
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> [!NOTE]
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> This issue doesn't indicate a malfunction of the hardware or system and doesn't affect the actual performance or functionality of the network adapter.
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## Status
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Microsoft is aware of this limitation and is exploring possible improvements for future updates.
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Microsoft is aware of this limitation and is exploring possible improvements in future updates.

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