Question Why is my ethernet limited to 100 mbps?

[Zombehh]

I've been googling around and have been seeing recommendations to go on device manager, your lan driver and change the speed and duplex to 1000 mbps, mine is on auto and 100mbps is the max i can change it too.

I have windows 10
motherboard is Z270X-Gaming K5

 

[kanewolf]

I've been googling around and have been seeing recommendations to go on device manager, your lan driver and change the speed and duplex to 1000 mbps, mine is on auto and 100mbps is the max i can change it too.

I have windows 10
motherboard is Z270X-Gaming K5

99 times out of 100 it is a cable problem. Get a new factory made cat5e or cat6a 100% copper ROUND cable, connected directly to your router.
Your motherboard has a "killer" network adapter. You should make sure you have the latest driver and get rid of all the rest of the killer software.

 

[boju]

I hate advice like that suggesting network negotiation speed or lan drivers, is it rarely ever to do with either of them, leave negotiation on auto. If auto is not working then it's something else. Unless having issues with 2.5gbe with gigabit routers then changing negotiation speed might work in that case.

Your issue is more likely network cable or router/switch. If router or switch (if use a switch to extend network to other devices) are gigabit then it's the cable. There's no such thing as cat 7 or higher network cables, if you had one these, they are fake afaik. Your typical cat 5e or 6 is fine.

For gigabit negotiation to work, all 8 wires must be in good condition. If one wire is dodgy negotiation speed drops to megabit which is 4 wires.

 

[Zombehh]

I hate advice like that suggesting network negotiation speed or lan drivers, is it rarely ever to do with either of them, leave negotiation on auto. If auto is not working then it's something else. Unless having issues with 2.5gbe with gigabit routers then changing negotiation speed might work in that case.

Your issue is more likely network cable or router/switch. If router or switch (if use a switch to extend network to other devices) are gigabit then it's the cable. There's no such thing as cat 7 or higher network cables, if you had one these, they are fake afaik. Your typical cat 5e or 6 is fine.

For gigabit negotiation to work, all 8 wires must be in good condition. If one wire is dodgy negotiation speed drops to megabit which is 4 wires.

hmm thank you, might be the router limiting the internet, Cox is <Mod Edit> i bought the cable from walmart and it said it was a gigabit speed so i doubt its a fake

 

[boju]

hmm thank you, might be the router limiting the internet, Cox is ! i bought the cable from walmart and it said it was a gigabit speed so i doubt its a fake

Lan negotiation speed should still say gigabit between you and router, it doesn't matter if isp is less. Check your router settings, negotiation speed will be there as well.

 

[boju]

walmart and it said it was a gigabit speed so i doubt its a fake

It is possible an end or both ends of the cable haven't been crimped properly. I've had that happen before. Bought a bunch of cables and a couple weren't crimped properly only doing megabit. Fixed it with a crimping tool.

If you know someone with a crimping tool that does rj45 plugs, would be worth a try. All it does is push contact blades through the wires, one couldn't have made it all the way through. Repress of the crimp and that's it.

 

[Zombehh]

It is possible an end or both ends of the cable haven't been crimped properly. I've had that happen before. Bought a bunch of cables and a couple weren't crimped properly only doing megabit. Fixed it with a crimping tool.

If you know someone with a crimping tool that does rj45 plugs, would be worth a try. All it does is push contact blades through the wires, one couldn't have made it all the way through. Repress of the crimp and that's it.

bro i literally just switched the cable to another another lan input in the router and it got rid of the limit!!!

 

[boju]

bro i literally just switched the cable to another another lan input in the router and it got rid of the limit!!!

So cable is alright then, lucky. Try the other port again when you get a chance. Maybe try blow it out. Should be fine, just slightly off contact. If you're happy im happy 👍