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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:
David 'LeNain' Bois is a professional Fortnite player for Envy. He can also be found streaming on Twitch.tv regularly.
For gaming, LeNain uses a AMD Ryzen 1600 CPU with a ASUS GeForce GTX 1060 GPU. He uses a MSI B350 TOMAHAWK motherboard. LeNain uses CORSAIR Vengeance LPX 16GB memory.