Your Ethernet link speed and your Internet speed are different measurements. The link speed shown by your computer is the rate negotiated between its Ethernet adapter and the router or switch; it is not the speed your Internet provider delivers. Check both: a low link rate points first to the cable, ports, adapter, or link negotiation, while a high link rate with slow Internet results points farther upstream or to test conditions.
Check the Ethernet link speed and Internet speed separately
Start by noting the computer’s negotiated Ethernet link rate, then run an Internet speed test over that wired connection and record the download and upload results. Repeat under similar conditions when comparing devices or network paths; one speed-test result alone does not identify a faulty component.
Windows
- Press Windows+R, enter
ncpa.cpl, and press Enter. - Right-click Ethernet and choose Status.
- Note the value shown for Speed. It is the local link rate, not your Internet speed. These steps are provided by TP-Link’s link-speed guide.
macOS
Open System Settings → Network → Ethernet → Details → Hardware and look for Ethernet hardware or link-speed information. Menu labels can vary by macOS release; TP-Link’s guide describes this route.
Why Ethernet may show only 100 Mbps
A connection negotiates only as fast as its slowest relevant part: the computer’s adapter, the router or switch port, and any intermediate equipment or cabling. If the link reports 100 Mbps when you expected Gigabit Ethernet, check for a 100 Mbps-capable port or adapter, a cable or termination problem, or another device in the path such as a wall jack, dock, switch, or USB adapter. A Cat6 label cannot make a 100 Mbps port operate at Gigabit speed.
#1 Best Overall
- High-Performance Connectivity: This Cat 6 ethernet cable is designed for superior performance, with a 24 AWG copper wire core. It provides universal connectivity as an ethernet cord for LAN network components such as PCs, servers, printers, routers, and more, ensuring reliable and fast network connections
- Advanced Cat6 Technology: Experience Cat6 performance with higher bandwidth at a Cat5e price. This network cable is future-proof, ready for 10-Gigabit Ethernet and backwards compatible with any existing Cat 5 cable network. It meets or exceeds Category 6 performance according to the TIA/EIA 568-C.2 standard
- Reliable Wired Network Solution: Known variously as a Cat6 network cable, ethernet cable Cat 6, or Cat 6 data/LAN cable, this RJ45 cable offers a more secure and reliable connection than wireless networks. It's ideal for internet connections that demand consistency and security
- Durable and Secure Design: The connectors of this ethernet cable feature gold-plated contacts and strain-relief boots for enhanced durability. Bare copper conductors not only improve cable performance but also comply with communication cable specifications
- High-Speed Data Transfer: With up to 550 MHz bandwidth, this ethernet cord is ideal for server applications, cloud computing, video surveillance, and streaming high-definition video. It also supports Power over Ethernet (PoE, PoE+, PoE++) for powering devices like IP cameras, VoIP phones, and wireless access points, ensuring fast and reliable network performance.
Check negotiation settings
For Intel Gigabit adapters, Intel recommends Auto Negotiation at both ends and a Gigabit-capable device at the other end. Intel Support’s article, last reviewed November 28, 2022, says: “Gigabit recommended setting is Auto-negotiation.” This advice is specific to Intel adapters; forcing a speed or duplex setting is not a universal fix. See Intel’s Gigabit troubleshooting guidance.
Reseat the cable and test the physical path
- Unplug and firmly reseat the Ethernet cable at the computer and router or switch.
- Confirm the router end is in a LAN port, not the port intended for the modem or Internet connection.
- Swap in a known-good cable and check whether the link rate changes. Microsoft recommends checking both cable ends and trying another cable; Intel likewise recommends a proven cable when troubleshooting Gigabit links. See Microsoft’s Windows network troubleshooting steps and Intel’s guidance.
- If the cable runs through a wall jack, switch, dock, or USB adapter, bypass one item at a time where practical to isolate the path.
Verify the supported speed of the computer adapter and every port along the route. Intel also recommends checking all cabling and trying a known-good Cat6-or-better cable for a suspected Gigabit cabling problem. Replacing cable is a diagnostic step, not a promise of faster Internet.
Rank #2
- High Performance Cat6 Cable - The Cat6 ethernet cables 100ft supports frequencies of up to 500 MHz and high-speed 10GB internet connection for LAN network applications such as PCs,computer servers,printers,routers,switch boxes,network media players,NAS,VoIP phones and more, while remaining fully backward compatible with your existing network.
- Outdoor&Indoor Ethernet Cable - The cat 6 ethernet patch cable features 8 solid copper conductors 24 AWG. Each of the 4 unshielded twisted pairs (UTP) are separated by a PE cross insulation to isolates pairs and prevent crosstalk and covered by a 5.8mm PVC jacket with RJ45 connectors and gold-plated contacts. The molded strain relief boots help avoid snags that will damage your cables. They are molded for flexibility and resist common wear and tear.
- Lan Cable with RJ45 - UTP(Unshielded Twisted Pair) patch cable with RJ45 gold-plated Connectors, this cat6 cable support Cat8 and Cat7 network and provides performance of up to 500 MHz 10Gbps and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), 1000BASE-T/1000BASE-TX (Gigabit Ethernet) and 10GBASE-T (10-Gigabit Ethernet)
- High Quality Control - are designed with extremely well-matched components for outstanding uniform impedance and very low return loss, providing lower crosstalk, and a higher signal-to-noise ratio. Each Cat 6 internet cable 6 ft goes through rigorous testing to ensure a secure wired internet connection with exceptional speed and reliability.
- Support – Cat6 Ethernet cable with CM grade PVC jacket complies with TIA/EIA 568-C.2, is ETL verified and RoHS compliant. If an item is defective or breaks within a year, we will issue a replacement. For questions or concerns please contact our friendly, USA-based customer Support team.
When cable category and length matter
Cable capability depends on the equipment and installation, not just the category printed on the jacket. As one model-specific example, Cisco documents its C9350 multigigabit switch ports as supporting 1, 2.5, and 5 Gbps over Cat5e, and up to 10 Gbps over Cat6 or Cat6A. In that switch-family documentation, 10 Gbps over Cat6 is limited to 55 m, while Cat6A can support 10 Gbps up to 100 m under specified conditions. Cisco cautions that cable condition and termination quality can affect performance; those figures are not a guarantee for other devices or home installations. See Cisco’s C9350 cabling specifications.
Find out whether the computer, router, or ISP is the bottleneck
Compare another device on the same Ethernet path
Connect another computer to the same cable and port if possible. If only one computer is slow, investigate that computer’s cable connection, adapter, or driver. If several wired devices are slow, compare wired and Wi-Fi results and restart the modem and router according to their manufacturers’ instructions. Microsoft recommends checking the router connection, trying another cable, restarting network equipment, and comparing another PC to narrow the cause; its page applies to Windows 10 and 11, and notes that Windows 10 support ended October 14, 2025. See Microsoft Support.
Recommended Free Tools
Rank #3
- Cat 6 performance at a Cat5e price but with higher bandwidth
- High Performance Cat6, 30 AWG, RJ45 Ethernet Patch Cable provides universal connectivity for LAN network components such as PCs,computer servers,printers,routers,switch boxes,network media players,NAS,VoIP phones
- Jadaol cat6 standard cable support Cat8 and Cat7 network and provides performance of up to 250 MHz 10Gbps and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), 1000BASE-T/1000BASE-TX (Gigabit Ethernet) and 10GBASE-T (10-Gigabit Ethernet)
- UTP(Unshielded Twisted Pair) patch cable with RJ45 gold-plated Connectors and are made of 100% bare copper wire, ensure minimal noise and interference
- The unique flat cable shape allows for a cleaner and safer installation. You can easily and seamlessly make the cable run along walls, follow edges & corners or even make it completely invisible by sliding it under a carpet.
Compare router and direct-modem results, if your setup permits
If your ISP arrangement allows a computer to connect directly to the modem, compare that result with the normal router-connected result. TP-Link says matching slow results in both configurations point toward the modem or ISP, while a faster direct-modem result points toward the router or its configuration. A direct connection may not be available or appropriate for every ISP setup. Disconnect the test connection and restore the normal modem-to-router arrangement afterward. See TP-Link’s slow-Internet troubleshooting guide.
Check the adapter driver only after simpler checks
If the physical path checks out and the problem is limited to one computer—particularly if it began after a system update—check the adapter driver and the computer or adapter maker’s support page. Before uninstalling a driver, download a backup from the manufacturer. Microsoft says Windows can attempt to reinstall the adapter driver after you restart. Network reset is a later option: Microsoft says, “Using network reset should be the last step you try.” Both recommendations are Windows-specific; see Microsoft’s troubleshooting guidance.
Rank #4
- 40 Gbps 2000 Mhz High Speed: The Cat 8 ethernet cable support max. 40 Gbps data transfer and 2000 MHz Brandwith, ideal for gaming and streaming, greatly improving upload and download speed, sound, image and resolution quality
- Excellent Anti-interference: The ethernet cable comes with 4 shielded foiled twisted pairs (F/FTP), pure copper core and gold-plated RJ45 connector, reducing interference, noise and crosstalk, making network speed faster and more stable
- Marvelous Durability: Internet cable wrapped with quality cotton braided cord, which makes the LAN cable stronger and more durable. The test proves that this internet cable can be bent at least 10000 times without broken, very suitable for long-term use
- PoE Supported: All lengths of ethernet cord can support the PoE power supply function except 65ft. You don't need additional power supply when installing a PoE camera, which is very convenient and safe
- Wide Compatibility: With the RJ45 Connector, network cable can be perfectly compatible with computers, laptops, modems, routers, PS5, X-Box and other networking devices. It can also be fully backward compatible with Cat7, Cat6e, Cat6, Cat5e, Cat5
Buy equipment only when a test points to it
- Ethernet cable: Try a known-good cable when swapping it is the next useful diagnostic step. Match the cable to the required speed, run length, and installation; Cat6 alone does not raise a connection limited by a slower port.
- USB-to-Ethernet adapter: Consider one if the computer has no built-in Ethernet port or if a compatible second adapter would help compare the computer’s built-in connection. Check compatibility with the computer and the adapter’s supported link speed.
- Cable tester: This is an advanced option for permanent in-wall cabling or higher-rate links, not a default purchase for ordinary home checks. Cisco recommends appropriate cable testing for 5 and 10 Gbps links in the cited switch documentation.
Before replacing anything, check that the proposed adapter, router or switch port, and cable support the rate you need. For a high-speed permanent run, category, length, termination, and cable condition all matter.
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