It depends on the chipset, and how fast your PC is to handle the load without any noticeable side effects. Onboard NICs are usually adequate with newer PCs that have plenty of RAM, fast CPUs and newer chipsets. On slower hardware, however, there may be noticeable slowdown with faster connections, and VPNs because of the higher resource utilization.
If you have a newer motherboard with plenty of RAM/CPU and a decent onboard NIC, with good drivers, you should be ok.
If you want the best, get a dedicated Intel Gigabit NIC (or some other good brand NIC) because of the stable drivers, and ample hardware to handle more load. It also depends on what settings you use with your adapter, any type of packet-coalescing will cause some type of latency and additional load. We have an article on Network Adapter optimization on the main site here: https://www.speedguide.net/articles/...imization-3449
VPN speed is dependent on your CPU/RAM and particular software in addition to the NIC. We also have an article on the different VPN types and what to use for best throughput, you can check the section on VPN protocols here: https://www.speedguide.net/articles/...-with-vpn-5051
I hope this helps
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