I have a temporary build in mid tower with double 280 GTS and Barrow SPB17-TM pump (waiting for Winter One). There's almost no difference (0.5-1C) in cpu and gpu temps between pump at 34% (2700rpm) and 60% (3700rpm). I checked it playing CoD Warzone at 3840x1600 and running 10 min Cinebench R23...