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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:
Reihana 'slaya' Green is a professional Fortnite player for Chiefs Esports. He can also be found streaming on Twitch.tv regularly.
For gaming, slaya uses a Intel Core i7-8700K CPU with a ASUS ROG Strix GeForce GTX 1080 GPU. He uses a ASUS ROG Maximus XI Hero motherboard. slaya uses G.SKILL Trident Z RGB Series 16GB memory and a Samsung 960 Evo 1TB SSD for storage.