I recently bought a TL-SG3428X switch, and a TX401 10GbE PCI-E network card.

There are about a dozen of computers connected to the normal 1GbE ports on the switch and they all work great, didn't even need any configuration, just plug and play.

However, I'm having issues with the one computer that I want to connect with a 10GbE connection.

I'm using a 10m cat7 cable (since the TX401 card has a RJ45 connector), and a copper to optic transducer (which should be and seem to be compatible) on the other side of it, connected to the SFP+ port on the switch.

The cable and network card work totally fine when connected to a regular 1GbE port on the switch, the problem only occurs when using the 10GbE port.

When it works, the network does reach high transfer speed beyond 1GbE, but there are constant disconnections, and the internet connection is very slow as well.

The switch provides both network and internet connection to all the computers.

I installed the latest firmware for the switch and the latest drivers for the network card.

The built in network port on the motherboard is disabled (and nothing is connected to it).

I'm running Windows 10 Pro version 20H2, i7-10700K, 32GB ram, Asus Prime Z490-A, Samsung 970 Evo Plus.

The local retailer tech support installed the Omada Controller as well and "adopted" the switch, but that didn't do much of anything.

I'm suspecting the issue lies within the many options of the network card driver, which I know almost nothing about.

At first the connection didn't work at all, but then I manually set the connection speed from auto to 10GbE.

Then the connection started working but the issues are as listed above.

I do not know enough about the rest of the options to solve the problems.

Any help or insight would be much appreciated!