Take for example the Arctic Cooling Alpine 11 Pro heatsink Frostytech is testing today. It's a dead simple extruded aluminum cooler, good for mainstream Intel socket 775 and 1156 processors with a TDP up to about 90W. The patented Arctic Cooling 95mm suspended fan spins at 500-2000RPM, but from the test results we've seen it's best to keep the PWM fan spinning at full tilt.