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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, Pika uses a Intel Core i7-8700K CPU with a EVGA NVIDIA GeForce GTX 1080 Ti GPU. He uses a GIGABYTE Z370N WIFI motherboard. Pika uses CORSAIR Vengeance LPX 16gb memory and a Samsung 970 EVO 1TB SSD for storage.