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13 years of watercooling experience here. Feel free to ask anything you want.

Uhm... I don't know if this sounds stupid but... do 2 240 radiators are as good as one 480 radiator? I could two 240 radiator for less than one 480. Also I can't find that many 480 radiators :/

2x240 should be as good as 1x480, provided they are of same fin density (and same fans used).