You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Thomas 'Tschinken' Hörak is an Austrian Fortnite player who previously played for E11 Gaming. He is currently a Twitch Streamer.
Tschinken uses the G-Wolves Hati HT-M 3360 Vista Blue gaming mouse.
For gaming, Tschinken uses a Intel Core i9-9900K CPU with a NVIDIA GeForce RTX 2080 Ti GPU. Tschinken uses CORSAIR Vengeance RGB Pro 64GB memory and a Samsung 970 EVO 1TB SSD for storage.