Yes, you might need a network card depending on your device and connection requirements.
Yes, you might need a network card depending on your device and connection requirements.
No, I haven't checked the LAN drivers yet. Could you confirm if they are correctly installed on your motherboard?
You should consider resetting your PC if you just installed new components.
Eliminate any doubts about your setup before purchasing a NIC. Otherwise, you're just wasting parts and money without solving the real issue. Do you have another functioning computer you can test on that network cable? Or could you move your PC near the switch or router temporarily using a short patch cable you know works well? Are you connected via a 100 megabit Fast Ethernet switch, or is it a 10/100 port at the other end? What motherboard do you have, and which switch or router are you linking to? Restart it, but don't need to reset Windows completely for this.
The connection speed displayed for Ethernet usage is the link speed.
You can view it by examining the details and structure as described.