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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, mOnKeY uses a AMD RYZEN 9 5900X CPU with a EVGA GeForce RTX 3080 FTW3 Ultra Gaming GPU. He uses a ASUS ROG STRIX B550-F GAMING motherboard. mOnKeY uses G.SKILL Trident Z 3200 memory and a Samsung 960 EVO 250GB SSD for storage.