You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Timo 'Hckerjack' Raufeisen is a German PUBG player who previously played for PENTA Sports.
For gaming, Hckerjack uses a Intel Core i7-7700k CPU with a ASUS ROG Strix GeForce RTX 2080 GPU. He uses a ASRock Fatal1Ty Z270 Gaming K4 motherboard. Hckerjack uses G.SKILL Trident Z RGB Series 16GB memory and a Samsung 860 Evo 250GB SSD for storage.
For streaming, Hckerjack uses a AMD Ryzen 7 1800x CPU with a ASUS ROG Strix GeForce GTX 1080 GPU. He uses a ASRock AB350 Pro4 motherboard. Hckerjack uses Corsair Vengeance LPX 16GB memory and a Samsung 860 Evo 250GB SSD for storage.