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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:
Nate 'Kreo' Kou is a professional Fortnite player for Lazarus. He can also be found streaming on Twitch.tv regularly.
For gaming, Kreo uses a Intel Core i7-8700K CPU with a NVIDIA GeForce GTX 1080 GPU. He uses a ASUS ROG Maximus XI Hero motherboard. Kreo uses CORSAIR Vengeance Lpx 16GB memory and a WD Green 240GB SSD for storage.