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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:
Adrian 'Lanjok' Roberts is an American Fortnite player who previously played for Kungarna. He is currently a Twitch Streamer.
For gaming, Lanjok uses a Intel Core i7-8700K CPU with a NVIDIA GeForce RTX 2080 GPU. He uses a ASUS ROG Strix Z370-E motherboard. Lanjok uses G.SKILL Trident Z RGB Series 16GB memory and a Samsung 850 EVO 1TB SSD for storage.
For streaming, Lanjok uses a AMD Ryzen Threadripper 1950X CPU with a NVIDIA GeForce gTX 1080 Ti FE GPU. Lanjok uses G.SKILL Trident Z RGB Series 32GB memory and a Samsung 860 EVO 1TB SSD for storage.