Report Core p3 in Chassis Posted October 17, 2016 Airflow is relevant in closed cases because without proper airflow, the warm air will stay trapped inside the case and heat up the components. Since the Core P3 is open, you will be fine with air coolers if you don't go crazy on the overclocking. The hot air can still escape. Installing fans where the radiator would usually go really only make sense if you want to cool your hidden hard drives or for aesthetical reasons. If you've got the fans anyway and will mount them onto the radiator when you put in the water cooling, go for it. If you don't install extra fans, that is no big deal either.