Originally Posted by wthenshaw
personally i would suggest wiring up a sort of daisy chain of female fan headers, coming to one final male header which can then plug into a fan controller.
so 8 fans on each header would mean you can control the speed of all fans on one dial for that sincle radiater, do the same for the other. that said, a six channel controller will allow you to have four spar for your chassis fans
alternately you could wire four fans (each side of rad) to one header and use two fan controllers (four or six channel) and lessen the strain on the controller
The main reason why I would do this (I to am a strong proponent of "push/pull", but more times than not, I just buy 1450 RPM fans and run them without any speed control, that way the noise is always the same ... quiet) is that in a "push/pull" config, you REALLY SHOULD never have the speed of your "push" and and your "pull" fan be different. This will actually hurt your cooling capabilities if, for example, you have the "push" fan spinning at 2000 RPM, and the "pull" only running at 800 RPM (or visa versa), because the slower fan on will end up starving the faster fan of the pair the air that is it trying to move. So as a MINIMUM, you should have your "push/pull" fans on the same controller channel that way they always run at the same speed.
And to be honest, there really isn't any great advantage to having one set of fans on your radiator running at 2100 RPM, and the next set of fans on the same radiator running at 800 RPM and the next set of fans on the same radiator running at 1500 RPM. That is why I would just get either a 6 or 8 way splitter and run the ENTIRE set of (4, 6, or 8) fans running at the same speed and controlled by 1 channel of the fan controller.