Here is a link to a good AIO cooler article from Anand that is a little dated but it tests the 14 different AIO's at 12 and 7volts and from 60, 100, 150, 200, 250, and a huge 340 watts using a dedicated tester like frostytech. Anyway it is a decent read. Edit for got to post the link Der http://www.anandtech.com/show/7738/clos ... -coolers/9
All I can say is I am super glad my 140xl's fans run at 700-1000 rpms now with fantastic delta temps. My 140mm jetflo fans sounded like jet engines until I hooked them up to the CPU header and I am glad I did not get the 7v downvolt cable since according to andand they would still be running at 1600rpms. As of right now at 700rpms they are silent since all I can hear are my cougar vortex 120mm PWM fans at 80% speed set by my sentry 2 fan controller, and I can barely hear them but they are quiet fans to start with.