Article ID: 000092838 Content Type: Troubleshooting Last Reviewed: 03/08/2023

Intel® NUC LAN Not Reaching Max Speed


Windows® 10, 64-bit*


Recommendations to resolve LAN performance issues.

  • Intel® Nuc has a 2.5 Gbps (i225-V) Ethernet port, but cannot get 2.5 Gbps out of it.
  • When testing through a demarcation point, the speed reaches up to near 3Gbps.

See the recommended troubleshooting below:

  • Double-check if the established connection speed in the settings can reach 1Gbps. To confirm this, go to Network and Internet Settings. View your Network Properties and scroll down to Link speed (Receive/Transmit).
  • Connect using an alternate LAN cable, to isolate if the issue is with the cable.
  • Ensure that Speed & Duplex settings on Advanced tab property of the Intel Ethernet Controller is set to Auto Negotiation.
  • Check other devices if the same issue is encountered.
    • If the issue only occurs with the reported NUC, then proceed with the other recommendations.
    • If the issue occurs across other devices, then contact your Internet Service Provider (ISP) to check if your connection and access point/router. If you bought the access point/router separately then contact the manufacturer of it instead.
  • Check if you have the latest LAN/Ethernet drivers for your NUC. You can find the latest drivers at Intel Download Center.
  • Update to the latest BIOS for your NUC. You can find the latest BIOS at Intel Download Center.
    • Identify your BIOS version and check if it matches the latest one at Intel Download Center.
    • If you already have the latest BIOS, still proceed in doing a BIOS recovery instead - to ensure that the current BIOS is not corrupted.
    • For NUC BIOS update/recovery instructions, kindly use the guide.
  • Check Windows update for any available updates, and ensure that you are using the latest operating system (OS) build.

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