You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Sawyer 'SirDimetrious' is an American Fortnite player who previously played for 100 Thieves. He is currently a Twitch Streamer.
SirDimetrious uses the Logitech G Pro Wireless Easter Pink gaming mouse.
SirDimetrious uses the BenQ ZOWIE XL2546 gaming monitor.
SirDimetrious uses the Razer BlackWidow Elite gaming keyboard.
For gaming, SirDimetrious uses a Intel Core i7-9700K CPU with a GIGABYTE GeForce RTX 2080 Ti GPU. He uses a GIGABYTE GA-X99P-SLI motherboard. SirDimetrious uses CORSAIR Vengeance LPX 32GB memory and a Intel 660p 1TB SSD for storage.