Noise Level Results
Not the greatest results on the chart, but from my experience with the previous Edge kit, and it using the same fans, you can see the old mark of 47dB with only 5V going through the fans. Today I ran them at 7.5V which is more along the lines of what the PWM control will bottom out a standard coolers fan. Here the HD kits, registering in at 50dB for the 220 HD and 51dB for the 320 HD, both a shade more silent than my original kits reading of 54dB.
Once 12V gets delivered to the fans, more realistically 11.83V through the fan controller I was using, I retested the original H2O-320 and again got a 72dB reading as you see it on the chart. The newer kits, while using the same fans have improved flow through the radiator to allow a slight drop in the readings I got with both of the HD kits. While not terrific results, it is still a step forward from the original and a welcomed drop in noise.