Having trouble getting Ethernet speed above 100 Mbps, any advice?

August 14, 2025 5 answers
Asked by TechWizard223
I'm stuck with my Ethernet connection at 100 Mbps, even though I've made sure that all my components, including the motherboard, cables, and modem, support higher speeds. I'm on a 1 Gbps plan with Xfinity and using the xb7 modem/router setup. Despite changing settings to 1 Gbps and trying out new cables, nothing seems to work. I've double-checked everything, but I'm still at a loss. Can anyone offer some help or troubleshooting tips?

Answers

CablesAndMore
Check if you've got any hubs or switches in the mix. Also, have you tested both the old and the new cables to make sure they aren't faulty? Sometimes the speeds reported in the Ethernet properties can be misleadingโ€”run some speed tests online to confirm.
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NetworkNinja42
Have you contacted your ISP about this? They might have some updates or issues in your area. It might also help to know what they say about any ongoing maintenance or problems theyโ€™re aware of.
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SpeedyTechGuru
Have you tried changing the settings on your network adapter back to auto? Also, disable Energy Efficient Ethernet in the advanced settings, if that's an option. And make sure you're looking at the physical link speed in Windows and not just relying on speed tests.
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GamerGuy1987
Try unplugging all other devices from your router. Sometimes having multiple devices can cause the router to drop the speed. After unplugging, reboot the router, and then plug each device back in one at a time to see if one of them is causing the issue.
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EthernetExplorer
It's crucial to confirm what your network card is actually negotiating. If it shows it's at 1 Gbps but your speed test is still capped at 100 Mbps, that really points to a software issue on your machine or possibly a problem with the ISP. If it's showing 100 Mbps, then we are looking at a possible hardware issue instead. Also, always double-check the type of cable you're using; it should be at least Cat5e for 1 Gbps.
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