Just received a new 27" i7 and was wondering how noisy it should be? The hard drive make a really subtle clicking sound which doesn't bother me at all, but there's a constant sound of flowing air, even at idle. If it was a Windows PC I wouldn't think twice but I just got the impression from other machines I've seen that at idle it should be completely silent. It's not by any means loud, but in a quiet room you can hear it blowing away through the vent at the top. The fan reports a speed of about 950 rpm by the way. Many thanks guys.