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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, Tennp0 uses a Intel Core i7-9700K CPU with a ASUS ROG Strix GeForce RTX 2080 Ti GPU. He uses a MSI MEG Z390 Ace motherboard. Tennp0 uses G.SKILL Trident Z Rgb Series 16GB memory and a Samsung 860 EVO 250GB SSD for storage.
For streaming, Tennp0 uses a Intel Core i5-7600K CPU with a MSI GeForce GTX 1050 TI GAMING X 4G GPU. He uses a MSI Z270 Gaming Pro Carbon motherboard. Tennp0 uses Crucial Ballistix Sport 16GB memory.