Doing some quick Google searching showed a few other people with similar issues with different MSI motherboards having cable related issues, even replicating what you tried with a laptop giving gigabit speed but the desktop only getting 100 Mbps, so may definitely be worth trying a new cable. Checking with a new ethernet cable just to be sure should be relatively quick and painless. Try booting Ubuntu off a USB, that will help rule out OS issues. Was the "other machine" you tested with only the laptop? If so, try disabling the laptop's wireless NIC and doing that test again.ĮDIT: What I mean by "that test" is to go into Control Panel\Network and Internet\Network Connections and look at the NIC's "Status" when you right-click the WIRED NIC on the laptop, with wireless NIC disabled. You should be expecting its status to show "1.0Gbps" connection and not 400Mbps. So, WHY were you expecting only 400Mbps on a wired Gigabit connection? That sounds more like the laptop was still on WiFi, not a wired connection. You stated originally that "When I unplug the Ethernet cable from my PC and check with a laptop, I can see the 400 Mbps connection I'm expecting" (emphasis added) and then you now state "Another machine plugged into the same cable gets full speed". Both machines are running Windows 10 Pro. Another machine plugged into the same cable gets full speed so it's not the modem/router/switch/cable. Thanks for all the replies, but I think some of the information in the description was overlooked. This computer has had a lot of different software VPNs installed over the years (Hamachi, Nord and others) - maybe one of those installed something that is causing a bottleneck (even when not in use)? I really don't want to reload Windows right now, but it may come to that. I've given all the NIC settings a pretty good lookover, disabled AV and also removed the NIC from device manager and let them reinstall. So that was a huge help as I now know it is something in Windows that is throttling. I decided to try MarkPayton's advice about booting from Linux to remove the OS from the equation and viola - speeds above 400 Mbps. In this case I did not mention that this specific PC was having the same issue in an entirely different office location and is now in a new location with new wiring, so I was pretty sure it was not a cabling issue. I too have seen those quirky things with cards and cables in the past.
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