Learn whether to mount your AIO radiator at the top or side of a panoramic PC case. Compare CPU and GPU cooling, airflow, clearance, and tube placement.

Compare top and side AIO radiator mounting for CPU and GPU cooling, airflow, pump orientation, radiator clearance, and installation compatibility.

Side-mounting an AIO radiator can improve CPU cooling, clean up the front intake path, and look sharp in modern glass cases, but it can also punish GPU temperatures, tube routing, fan pressure, and long-term pump behavior if the layout is wrong.

I went past the forum folklore and looked at controlled thermal testing, official case fitment data, and real airflow guidance. The answer is not “front bad, top good.” It is uglier than that, and more useful.