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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:
Brendan 'Falconer' Falconer is a professional Fortnite player for 100 Thieves. He can also be found streaming on Twitch.tv regularly.
For gaming, Falconer uses a Intel Core i7-8700K CPU with a NVIDIA GeForce GTX 1080 Ti GPU. He uses a ASUS ROG Strix Z370-E Gaming motherboard. Falconer uses CORSAIR Vengeance LPX 16GB memory.