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You don't need two PC's to stream to be a successful streamer, but it does have 2 big advantages:
For gaming, Tfue uses a Intel Core i9-9900K CPU with a NVIDIA GeForce RTX 2080 Ti GPU. He uses a ASUS ROG Strix Z390-E motherboard. Tfue uses G.SKILL Trident Z Rgb Series 16GB memory and a Intel Optane 905p 960gb SSD for storage.
For streaming, Tfue uses a AMD Ryzen Threadripper 2950x CPU with a ASUS GeForce GTX 1650 GPU. He uses a ASUS ROG Zenith Extreme Alpha X399 motherboard. Tfue uses HyperX Predator DDR4 Rgb 32GB memory and a Samsung 860 EVO 500GB SSD for storage.