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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:
Musse 'Ares' Salah is a British Fortnite player who previously played for Misfits. He is currently a Twitch Streamer.
For gaming, Ares uses a Intel Core i7-9700K CPU with a NVIDIA GeForce RTX 2080 Ti GPU. He uses a ASUS ROG Strix Z390-F Gaming motherboard. Ares uses CORSAIR Vengeance RGB 16GB memory and a Samsung 860 EVO 1TB SSD for storage.