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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, MoNsTcR uses a Intel Core i7-8700k CPU with a ASUS ROG Strix GeForce GTX 1080 Ti GPU. He uses a ASUS Rog Strix Z370-I Gaming motherboard. MoNsTcR uses G.SKILL Trident Z RGB Series 16GB memory and a Samsung 850 EVO 500GB SSD for storage.
For streaming, MoNsTcR uses a Intel Core i7-7700K CPU with a MSI GeForce GTX 1070 GPU. He uses a MSI Z170A GAMING M7 motherboard. MoNsTcR uses CORSAIR Vengeance Lpx 16GB memory and a Samsung 850 EVO 250GB SSD for storage.