You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Gustav 'Tickeling' Hogland is a professional Fortnite Player for Alliance. He can also be found streaming on twitch.tv.
For gaming, Tickeling uses a Intel Core i9-9900K CPU with a EVGA GeForce GTX 1070 GPU. He uses a ASUS ROG Strix Z390-F Gaming motherboard. Tickeling uses CORSAIR Vengeance RGB Pro 16GB memory.