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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:
Kevin 'LeTsHe' Fedjuschkin is a professional Fortnite player for Team Atlantis. He is also a content creator on youtube and can be found streaming on Twitch.tv regularly.
For gaming, Letshe uses a Intel Core i7-9700K CPU with a NVIDIA GeForce RTX 2070 GPU. He uses a MSI Z390-A Pro motherboard. Letshe uses G.SKILL AEGIS 16GB memory and a Patriot Burst 480GB SSD for storage.