The 80mm fans have four pins (direct for a motherboard header). [Unlike the smaller 60mm fans that have three pins and a 4-pin molex adapter which are not quite as good]
This 80mm fan is very well engineered and manufactured, and is about as silent as youll find. Its quiet at higher speeds too but with the increased airflow you get the inherent airflow noise of course.
New to Noctua but very very impressed with my four Noctua purchases so far.
The rubber mounting pieces are brilliant and should be standard for ALL computer fans.
The included low-speed fan adapters are a great idea, although I didnt need them as my motherboard has enough speed control.
Would I buy this fan again? Yes absolutely.