Quote Originally Posted by millertime359 View Post
maybe because the fluid is moving too faster for the slower fans to keep up with cooling the radiators? Or I just completely missing it?
You are closer to the truth than NaeKuh thinks! I wasted my breath on this one a long time ago, blocks may like as much flow as you can feed them but radiators certainly do not unless you ramp up the amount of air that you are horsing through the core.

@Martin, if you have any super finger choppers (220cfm+ delta's), try those on the same radiators and the cooling performance will improve. Please wear gloves and ear plugs though!