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Thanks for reaching out Trch. The case, Phanteks P400, should be able to hold the Asus Prime X299. The power supply is a 800 watt PSU, however the brand varies. If you plan to use the Intel Core i9, you will need to use the Asus Prime as that is compatible with the socket, however the old motherboard will not. If you have any further questions or concerns then please do not hesitate to give our tech support agents a call for any assistance; we're always happy to help. Tech support: (888)937-5582 - CyberpowerPC Support
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