The maximum speed of the fan is about 1400. But He's been very loud. If one restricts him to 1000, then it goes somewhat, but quietly he is not yet. He hums still audible. I had ordered 3 (for 2 PCs) and have expanded within 4 weeks every 3 again because it myself at 1000 revolutions were still too loud. One deafened even after 4 weeks (in spite of decoupling!). I have now installed fan of Scythe and Sharkoon instead. For me, the Arctic fans were so smooth a bad buy. The only advantage: control by PWM.
