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You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Joseph 'Tecnosh' Touma is a Brazilian player who is currently playing PUBG, along with some other games. Joseph used to stream on Twitch, but recently moved to Facebook Gaming platform.
For gaming, Tecnosh uses a Intel Core i7-8700k CPU with a NVIDIA GeForce GTX 1080 Ti GPU.