You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
NoWonder is a professional Fortnite player for G2 Esports. He can also be found streaming on Twitch.tv regularly.
For gaming, NoWonder uses a Intel Core i7-5930K CPU with a NVIDIA GeForce Titan X Pascal GPU. He uses a ASUS ROG Rampage V motherboard. NoWonder uses CORSAIR Vengeance LPX 64GB memory and a WD Blue 250GB SSD for storage.