I have Mo-Ra 420 PRO with 420 and 280 Alphacool radiators.
Did I need all of them for better and low noise cooling ?
I can sell 420 and 280 radiators and build only with big one or keep them all for better temps.
Yeah, a 420+280 is a lot of cooling. What are you trying to keep cool and how much overclocking are you doing? It really depends on what you're running on how much radiator area/volume you need. A single 480 rad is pretty good for most builds, but again highly dependant on what you have and what you are trying to do.