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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:
Samuel 'Astro' Vidal is a professional Fortnite player for Team Atlantis. He can also be found streaming on Twitch.tv regularly.
For gaming, Astro uses a Intel Core i5-8600K CPU with a NVIDIA GeForce GTX 1060 GPU. He uses a MSI Z370 PC Pro motherboard. Astro uses Ballistix Elite 16GB memory and a Kingston A400 240GB SSD for storage.