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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, rawryy uses a Intel Core i9-9900K CPU with a MSI GeForce GTX 1080 Ti GPU. He uses a ASUS ROG Strix Z390-E motherboard. rawryy uses CORSAIR Vengeance LPX 16GB memory and a Samsung 970 EVO Plus 500GB SSD for storage.