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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, pr0phie uses a Intel Core i7-8700k CPU with a ASUS ROG Strix GeForce GTX 1080 Ti GPU. He uses a ASUS ROG Maximus X Code S motherboard. pr0phie uses G.SKILL Trident Z RGB Series 32GB memory and a Samsung 960 EVO 250GB SSD for storage.