Bear in mind that if you get an nVidia GPU, it can handle all of the twitch stuff with shadowplay, and it'll have a much smaller impact than other alternatives, as there's not as much copying back and forth as with CPU-based solutions, and video compression is faster on something super parallel like a GPU.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
