Yes, the NZXT X63 is compatible with the 5800X.
Yes, the NZXT X63 is compatible with the 5800X.
This setup is typical for an AIO, delivering around 40 horsepower during idle at 70% throttle. The 5800x cam software handles it easily.
It should match most other 280mm AIO models closely, and includes NZXT's outdated CAM tools.
I've owned it for a year now. There aren't many complaints, it's quite silent and the interface is super straightforward. I've been testing it with a 8700k.