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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, Ollie uses a Intel Core i9-9900K CPU with a NVIDIA GeForce RTX 2080 Ti GPU. He uses a MSI MPG Z390 Gaming PRO Carbon motherboard. Ollie uses CORSAIR Vengeance Lpx 32GB memory and a Crucial MX500 1TB SSD for storage.