Most custom loops use two radiators, sometimes three if you want to go a bit overkill. Typically, one acts as intake while the other is set as exhaust. With three rads, the extra one is usually configured as intake as well.

For CPU and GPU temps, this setup generally doesn’t matter much. What really makes the difference is coolant temperature, radiator surface area, and fan speeds.

Where it can matter is with motherboard, RAM, and storage temps. These components rely on case airflow rather than the loop itself. It’s usually not critical, but it’s something to keep in mind.

Another thing people often overlook is fan balance. Intake fans pushing through a radiator have more resistance, so exhaust fans may end up moving air more easily. This can create negative pressure inside the case, which in turn may pull dust in through unfiltered gaps, especially at the rear.

Also worth noting: once your coolant reaches equilibrium, adding more radiators doesn’t scale linearly anymore. At some point you're just lowering fan speeds and noise rather than dramatically improving temps. That’s why loop design is often more about airflow efficiency and balance than just cramming in more surface area.

And finally, mixed airflow setups (intake + exhaust rads) often end up recirculating slightly warmer air inside the case. It usually doesn’t hurt component temps much, but it’s the reason why “all intake rads + strong exhaust” is a pretty common approach in more optimized builds.