Windows 10: Strange LAN speed behaviour

I currently have 3 computers with windows 10 installed (2 laptops and 1 desktop) and I have a contract for Gigabit internet (1000 down/200 up). On the two laptops, using a LAN connection, speed is just fine at around 850/900 mbit/s. My desktop pc is a whole other story

For some programs, for example while using Opera Browser, I can download files at 300/400 mbit/s, and I get 100 down/40 up

In contrast, while downloading FS 2020 I can only get to 14 mbit/s and it is taking forever, and doing multiple Speedtests with the official windows app I only get 40 down/50 up.

I have checked if the problem was related to a bad wiring, by running test with my laptops connected to the same LAN cable of my desktop, and speeds remained high,

Most importantly I've installed Linux Mint on a usb flash drive to do a test using another OS, and I reached speeds of 900/950 mbit/s.
So the problem is only related to this particular install of windows 10.
I've checked if I had the correct drivers for my motherboard's network interface, and they were.
I also checked that internet speed wasn't capped by any external program of any kind, and I couldn't find any potential problems.

At this point i don't know what else to try...

(for Speedtest.net I made sure to be connected to the same server for every test)

submitted by /u/magub19
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:)

 

E8600 strange behaviour

go into your bio's and disable speed step

 

E8600 strange behaviour

Won't disabling speed step make it always be at 4GHz?

 

E8600 strange behaviour

that's what speed step does