You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
Cohhcarnage uses the Razer DeathStalker Expert gaming keyboard.
For gaming, Cohhcarnage uses a Intel Core i7-6950X CPU with a NVIDIA GeForce RTX 2080 Ti GPU. He uses a MSI X99A SLI PLUS motherboard. Cohhcarnage uses CORSAIR Vengeance Lpx 32GB memory.
For streaming, Cohhcarnage uses a Intel Core i7-6950X CPU with a EVGA GeForce GTX 1080 Ti GPU. He uses a ASUS X99 Deluxe II motherboard. Cohhcarnage uses HyperX Fury Black 32GB memory and a Samsung 850 EVO 1TB SSD for storage.