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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 Intel Core i7-8700K CPU with a GIGABYTE GeForce GTX 1080 Ti GPU. He uses a MSI Z370 Gaming M5 motherboard. mOnKeY uses G.SKILL Trident Z 3200 memory and a Samsung 960 EVO 250GB SSD for storage.