Understanding Ethernet Speed Discrepancies on Your PC: Troubleshooting and Solutions
Recently, many users have encountered perplexing network speed issues despite having high-speed internet plans, especially when connecting via Ethernet. A common scenario involves achieving significantly slower download speeds on a wired connection compared to Wi-Fi, even with brand-new cables and proper setup. Below, we explore potential causes and actionable steps to resolve such issues, drawing from a real-world example.
Case Overview:
A user upgraded to AT&T’s 1 Gbps fiber internet service and observed the following:
– Speed test with the desktop connected directly to the router via Ethernet yielded only ~90 Mbps download speed.
– Connecting via Wi-Fi produced approximately 600 Mbps, closer to expected performance.
– A speed test within the AT&T Smart Home Manager app indicated that the service itself was delivering high speeds, confirming the issue was localized to the PC.
Key Details:
– The PC is relatively new (MSI MAG B650 TOMAHAWK motherboard, 3 months old).
– Multiple Ethernet cables were tested, including new ones straight from the box.
– Network settings were checked to ensure autonegotiation (speed and duplex) was enabled.
– Other devices (like an older laptop) connected via Ethernet achieved near 970 Mbps download speeds, suggesting the issue is specific to the desktop.
Potential Causes and Troubleshooting Steps:
- Assess Hardware Compatibility and Age
Despite the motherboard being relatively new, it is still possible that the Ethernet port is experiencing issues—either due to a hardware defect or driver problems. Confirm that: - You are using the latest motherboard chipset drivers, especially for LAN.
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The BIOS is up to date.
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Verify Network Adapter Settings
- Ensure the network adapter is configured correctly:
- Set to ‘Auto Negotiation’ for speed and duplex.
- Disable any manually set speeds or duplex modes that might limit performance.
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You can do this via Device Manager:
- Right-click on Start > Device Manager > Network Adapters > [Your Ethernet Adapter].
- Properties > Advanced tab > Speed & Duplex > set to ‘Auto Negotiation’.
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Update or Reinstall Network Drivers
- Sometimes, driver corruption or incompatibility can cause limited link speeds.
- Download the latest drivers directly from the motherboard manufacturer’s website or the network card chipset provider.
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Consider uninstalling and reinstalling the network driver for a clean setup.
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**Test with a
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