Review on 🔇 Noctua NF-P12 redux-900: Silent 900 RPM 120mm Grey Fan - Ultra Quiet Cooling Solution by Chad Sornsin

5 stars because you can't do better with Noctua at this price. However, keep in mind that at 900 rpm you're not building much pressure and your airflow is pretty weak. If you have material blocking the fan, you will find that airflow has decreased significantly. The noise level is quiet, however, and if you have the wit to line them up for the air intake, you'll be happy. I wouldn't use them for a heatsink fan and spend the extra money on higher airflow 4-pin fans.