I got this system up and running a week or so ago and this is my only issue. I get full download speeds but upload speed is terrible. I have Google Fiber and also transfer large files across my LAN and both show really bad upload speeds, in the less than 100 Megabit range. Download speeds are fine. A Macbook Pro sitting next to it plugged into the same switch is fine and the motherboard I had before this with an Intel NIC was fine so its 100% the Realtek 8125B. I've used the drivers from MSI and I've used the latest and greatest from Realtek which are the Win10_10043_08212020 but had the same results. Anyone else have a similar issue?
To illustrate how bad...
To illustrate how bad...