You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Nikolai 'Kritikalmotion' Seth is a Australian player who currently plays for Team Bliss.
Kritikalmotion uses the Logitech G Pro Wireless gaming mouse.
Kritikalmotion uses the Logitech G Pro X Gaming Headset.
Kritikalmotion uses the BenQ ZOWIE XL2430 gaming monitor.
For gaming, Kritikalmotion uses a Intel Core i7-7700K CPU with a ASUS ROG Strix GeForce GTX 1080 Ti GPU. He uses a ASUS ROG Strix Z270-F motherboard. Kritikalmotion uses CORSAIR Vengeance LPX 16GB memory.
For streaming, Kritikalmotion uses a AMD Ryzen 7 2700X CPU with a GIGABYTE GeForce GTX 770 GPU. He uses a MSI B450 Tomahawk motherboard. Kritikalmotion uses CORSAIR Vengeance 8GB memory and a Kingston A400 120GB SSD for storage.