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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, such as League of Legends. 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.