Thanks for the links to the xbit articles.
I was considering placing two Scythe Slip Stream 1300 RPM PWM fans on one header so that I might use another mobo header for a bottom fan in a Define Mini case. I'm not sure if they'd ever be run at full speed. I doubt it.
One odd thing I notice in the xbit article: They measure a Slip Stream 12M @1170 RPM at 14.2 CFM, while the Slip Stream PWM @1050 RPM pushes 19.1 CFM of air. If they're the same size and have the same blade design, how can that be?http://www.xbitlabs.com/images/coolers/ ... fm_xbt.png