[SOLVED] My Ethernet Speed is being capped at 100 mbps and I cannot find a solution

[Dinglebert]

Firstly, hello and thanks for any help.

Will be as precise as I can.

Last week was upgraded to Fibre to the House with BT in UK. My maximum speed on the package is 150mbps. I can get very nearly those speeds on all my wireless devices. At 148mbps in the same room, drops to 140mbps in other rooms. So I know the smart hub is doing what it should.

I connect two pcs to the network via Powerlines. The max speed on the powerlines is meant to be 1000mbps.

The Pc's are connected to the powerlines via Cat5e cable on one PC and Cat 7 cable on the second.

First PC no issues its a solid 150mbps.

The second PC, my pc, is not getting above 100mbps. So far to resolve this I have tried switching the powerline adapters. No change. So they are not the issue.
I have tried different cat 7 and cat 8 cables but no change.
I have tried a usb 3.0 to ethernet connector but no change still maxing at 100mbps.

I have updated the lan drivers to latest but again no change.
Windows 10 is fully updated.

My ethernet is Realtek PCIeGbE Family Controller

I have ensured its sitting at 1gbps in the settings and tweeked the settings as found as previous solutions to this issue.
I have used TCP otimizer on the settings to see if that would make a difference but it didn't.

At a loss as to where the problem actually lies. Do I try yet another cable? I can't use the cable which I know works for other PC as it needs to be 2 metres and that one is just a short one.
Do I try a wireless card in the PC? Easy enough to fit but would have to be bought and reluctant to do so if its still going to get throttled at 100mbps.

Anyone able to suggest something I may have missed? Many thanks

 

[bill001g]

Unless you're using 6a, 6 didn't do much of anything above the 5e spec--

Cat6 was actually invented to allow gigabit ethernet over just 2 pair of wires. This is the difference between 1000-t and 1000-tx. Like most things the cable vendors wanted more money so they pushed for the standard that would require replacing cable. The equipment manufactures luckily decided to support the 4 pair solution. There was just 1 cisco router interface board that I know support both. It was a constant problem to get auto negotiation to work. So now the cable vendors had a pretty much dead cable standard but now they can only sell it on marketing hype rather than a real need.

 

[SamirD]

Cat6 was actually invented to allow gigabit ethernet over just 2 pair of wires. This is the difference between 1000-t and 1000-tx. Like most things the cable vendors wanted more money so they pushed for the standard that would require replacing cable. The equipment manufactures luckily decided to support the 4 pair solution. There was just 1 cisco router interface board that I know support both. It was a constant problem to get auto negotiation to work. So now the cable vendors had a pretty much dead cable standard but now they can only sell it on marketing hype rather than a real need.

Great to know! Did they increase the twists, jacket, or the copper thickness to get that bandwidth over a single pair?

 

[bill001g]

Not sure the documents make my head hurt. Something related to support of higher frequencies. This is also why cat6 can run 10g for short distance