Thanks. I tried a Corsair H50 in the past and must admit hearing the rush of air going through the radiator was a bit annoying when just browsing the web (think the fan ran a constant speed). Am pleased with a huge tower Noctua in terms of noise and cooling but in a small case PC I'm building want to keep weight down and noise as low as possible when the system isn't under load. Cooling I don't mind if the same as an air cooler.
I've never really heard any significant noise from the air moving through the rad on the Antecs I've experience of - but have experienced a few of the 600 series and the 1250 I had which made quite annoying pump whine noise - which isn't that noticeable when the fans are turned up but as I mostly run 140mm fans at 600rpm it was very noticeable in comparison.
I had to rejig the fans a bit to get the same kind of ballpark cooling performance out of the tower as the AIO mind - its bracketed by 140mm case fans, one (standard exhaust position) now regulated by the CPU temperature and I had to turn the intake one up a little as well but its still pretty quiet as that is without the 2 extra AIO fans.
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