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My onboard is a cheapo Realtek thoughI bought the classic Intel NIC that's been around for ages to see if it was better than my z87 onboard Intel NIC.
It made absolutely ZERO difference. It's now in an old skool PC I built randomly.
Unless the drivers for the onboard NIC are horrible, getting a dedicated card isn't going to make a heap of difference. Performance over the last few feet isn't going to have a major (if any) impact when measured against the hundreds or thousands of miles outside of your PCs control.
I have an Intel CT adapter. The way I tested it is I watched the same YouTube video and watched my CPU utilization (6600k). My CPU was consistently around 10% lower utilization while using the CT while watching video.
Now, that doesn't necessary mean it's going to translate to real world experience, but in certain circumstances I can see why you would want the dedicated NIC if you have both CPU intensive and network intensive activity at the same time.
Intel I219V onboard on a z170.What were you comparing it against though?
For me, my z87 Intel onbaord NIC chip was on a newer process than found on the Intel CT adapter (90nm versus 65nm) so technically older, so not surprised it made no difference.