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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:
Adam 'Crunch' Escobedo is a full-time Twitch streamer for FlyQuest. He is currently focusing on Fortnite.
For gaming, Crunch uses a Intel Core i7-6700K CPU with a MSI GeForce GTX 960 GPU. He uses a ASUS Prime Z270-A motherboard. Crunch uses CORSAIR Vengeance LPX 16GB memory.