In General, everything is very poorly thought out, you need to fire your engineers. Of the 3 modes, not one is good. 1. Silent(896 rpm) it is very noisy. 2. Max rpm is the turbine of the plane. 3. Passive, this is the stove for my video card, when the power supply stands fan in the case, and when the fan does not suck out hot air, it goes up. Need 4 mode starting from 100 rpm and ending with 1500 at 100% load on the unit. Load 20% = 100 rpm 25%-200 30%-300 35%-400, 40%-500, 45%-600, 50%-700, 55%-800, 60%-900 70%-1000, 75%-1100, 80%-1200, 85%-1300, 90%-1400, 95%-100% maximum.