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Why is my Ethernet Upload Speed Stuck at 70Mbps While Wi-Fi is Over 250Mbps?

June 7, 2025 5 answers
Asked by TechieDude42
Hey everyone, I'm in a bit of a pickle and need some help! I recently had fiber installed at my place, and during the tech's visit, we tested the Wi-Fi with his tablet and it was hitting over 500Mbps downloads without a hitch. Perfect, right? I'm on a plan for 500 down and 250 up, so I expected good results all around. However, when I connect my PC to the router via Ethernet and run speed tests, everything looks fine for downloads—they're solid at around 500Mbps. But the upload speed? It stubbornly caps out at 69-70Mbps, no matter what I try. It seemed like a fluke at first, but it's been consistent. I've checked a few things: - My network adapter can handle 1Gbps and 2.5Gbps, and everything's enabled. - I've tried all the router's Ethernet ports, but the issue persists. - I even swapped out the Cat6 cable for a different one, with no change. - I tested with another router, and still no improvement. Interestingly, my Wi-Fi upload speeds are great, easily over 250Mbps, but the wired connection just won't budge from that 70Mbps ceiling. Any tech-savvy folks out there have any ideas on what could be causing this? I'm getting desperate here! Thanks in advance!
Ethernet fiber Hardware tech support troubleshooting upload speed wireless

Answers

FiberFanatic
Is your ISP-provided router potentially the issue? Sometimes they can have limitations. It might be a good idea to give them a call and see if they can run tests on their end—it could lead to a solution!
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TechSavvySam
A quick check that might help: right-click the network icon on your PC, go to 'Network and Internet Settings', then into 'Ethernet'. There, check the 'aggregated link speed'—that should tell you the theoretical max speed of your connection. If it’s way below what it should be, there’s your clue!
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UploadWarrior88
It sounds like you’ve narrowed it down to your PC. Before diving in further, make sure you're not running any VPNs or antivirus software that could be messing with your upload speeds. Also, check the Ethernet driver in your device manager to ensure everything's set up properly. Just to ask—are the router ports you’re connecting to running at 10/100Mbps instead of gigabit?
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EthernetWizard
Lastly, try resetting your network stack using the command prompt. Open Command Prompt as Admin and type the following commands, pressing Enter after each one: netsh winsock reset, netsh int ip reset, ipconfig /flushdns. After executing these, restart your PC and see if your upload speed improves. Good luck!
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NetworkNinja77
You might want to check if your network card's drivers are up to date. Sometimes the generic drivers installed by Windows aren’t the best. Go to your motherboard or network adapter manufacturer’s website and grab the latest specific drivers. Uninstall the old ones, install the new ones, and restart your PC. If that doesn’t fix it, it's worth checking your cables—make sure they're not from some off-brand that might not meet specs.
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