Question about Corsair H115i RGB Platinum

According to the technical data on the manufacturer's website: https://www.bequiet.com/de..., a 240mm radiator can be optionally installed in the lid. Depending on this, you must consider whether and where you install additional fans. It is possible that the dimensions will be affected if you install additional fans at the front and/or rear.
The cooling capacity depends on your intentions. If you want to overclock the CPU to the max, then you have to be careful, but yes, it should probably be enough.
Use the cooler with a Ryzen 7 3800x without having overclocked anything.