Hey everyone,

Everything has been working just fine and internet speeds have been working just fine (I have 1 Gbps fiber internet). I had installed a Netgear USB wireless adapter to test something. Once I got my machine hardwired back to ethernet, it now automatically sets it to cap at 100 mbps. I have done all sorts of testing (re-installed drivers from EVGA website, installed drivers directly from Intel, played with Flow Control and Speed & Duplex, and nothing works. When I tried to set it to 1 Gbps with full duplex in Speed & Duplex, it wouldn't find a connection no matter what I did until I set it back to Auto-Detect. I flashed the BIOS to the latest, made sure Windows was updated, and nothing worked. Completely wiped and installed Windows from scratch as a last ditch effort and it is still capped at 100Mbps.
 
Before anyone says that it is cabling, I unplugged the ethernet connection from my PC and plugged it into my laptop with the WiFi adapter disabled and speeds shot into the 800Mbps area with no problems at all. Plugged it back up into my PC and everything capped back to 100Mbps. Does anyone have any other ideas?? I'd really rather not RMA this but is that my only option at this point?

I don't have any kind of QoS or traffic control going on with my router.
I am using the Netgear Orbi RBK50 router+satellite in my home. I have checked my devices status on the web GUI and it is just showing as connected. I have tried plugging it in directly to the router and to the satellite. Both have the same exact result of only 100Mbps.
The only thing that I have changed from default on the Orbi is of course the SSID and password. I have also updated the firmware in the past but no firmware update coincides with this incident. Again, I can plug another device into the same line and get my desired speeds so there is no port/cabling problem.

These might have the answer
 
Ethernet Adapter Stuck at 100MBPS
 
HELP!!! Lan gigabit alwasy detect 100mbps Solved - Windows 10
 
Solved: Wired Ethernet line to pc is running at 100mbps in ...
 
Gigabit Ethernet problem, stuck at 100mbps - Microsoft Community
 
 

You looked at that Registry hack - last post - HELP!!! Lan gigabit alwasy detect 100mbps Solved - Windows 10
 
[I've Not Tested that specific - Reg Edit - so make a backup first, if you decide to try it]
 
green/green = 100 Mbps max
 
 
Speed indicator:

• Amber on – Operating as a Gigabit connection (1000 Mbps).¹
  
• Green on – Operating as a 100-Mbps connection.
  
• Off – Operating as a 10-Mbps connection.
  

 
Maybe another member has a solution