Quite correctI pretty positive that you can't change the speed unless it is plugged into your motherboard.
True but pretty much every single board out there does (to a degree at least) ... due to the standardization of the sensor and control ICssome motherboards don't support the speed changing of the fans...
Bah i hate them 3pin friggen fans ... 4pin molex for meOr maybe they are cheaper and just don't have the RPM wire