Questions about NZXT C1200 Gold ATX 3.1 white | 1200W PC power supply unit

Don't know about the case compatibility, but it's enough for your configuration, actually, more than enough. I will tell you one think though, the GPU cable is no good with this PSU, someone else reported the same. It just doesn't fit the connector on the GPU side, you'll have to buy an extra one. I took the angled one on this site and it worked out ok. Much better clearance and no bending cables.

The power supply is compatible with the Lian Li O11 Dynamic EVO XL case, as it is in ATX format and measures less than 220 mm in length, which corresponds to the case's specifications. For an RTX 5080 graphics card, a 1200 W power supply is generally sufficient, but this depends on the other components in the system. Make sure that the total power required by all the components does not exceed 1200 W.

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Yes, it is.