Thanks. On my current build I have silent wings 3 on 420mm and 280mm rads. Might upgrade those, will see how the 4's are on my bros build first.Good choice! I have the Silent Wings 3 in my BeQueit case and they are really good. I even put them onto the triple rad. I might redo the rad with the Silent Wings 4 due to the improved pressure difference - which apparently is a good thing for the rad.