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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:
Fabian 'Derox' Real is a German Fortnite player who previously played for Kungarna. He is currently a Twitch Streamer.
For gaming, Derox uses a Intel Core i9-9900KF CPU with a NVIDIA GeForce RTX 2080 Super GPU. He uses a ASUS Prime Z370-P II motherboard. Derox uses HyperX Fury 16GB memory.