I initially installed it at the top, it goes in, although a little crooked with an Asus b550 atx board.then mounted it on the side, as I mounted the radiator 360mm from the Gpu Aio on top.works great.cools a Ryzen 9 5800x in the office Pc at 40% load when gaming max.temperature 50 degrees,controllable with mainboard software from Asus and RGB with Aurasync.the cooling performance is very good and the pump is very quiet.I had previously installed an Asus Rog Ryujin 360mm and the Asetek pump was simply too loud, so I installed it in a Corsair 7000D Airflow as a stopgap before the parts for the custom loop were delivered.Surprising for me was the fact that at this favourable price a tube of thermal paste from Arctic was included and also all accessories for various sockets e.g. am4/5 or also those from Intel.