A few pages back (starting at post #4265) a few kind GAFfers helped me with a lot of fan questions. I'll give you what I understand as a crash course, and others can correct me if I'm wrong.
There are 3 pin motherboard headers and 4 pin motherboard headers (you'll need to check your specific model to see which you have - update: your board has two CPU fan connectors, one is PWM the other isn't - and three system fan headers and none of them are PWM). All 3 pin headers are voltage controlled, so the speed of the fan is controlled by altering the voltage being supplied to the fan. It's basically just a DC motor with a blade on it, so more power = faster fan.
4 pin headers sometimes have what they call PWM or pulse width modulation, which uses the fourth pin to control the speed of the fan. It does this by essentially sending pulses of power to the fan (like turning it off and on really fast) and allows for more gradual control of the fan speed. A lot of motherboards have PWM headers for the CPU fan, but a lot of the other headers (even if they have four pins) might not be be PWM.
So you have 3 pin and 4 pin headers on the motheboard (where you can plug the fans up), and you also have 3 pin and 4 pin cables depending on whether your fans are PWM or not. You can plug a 3 pin fan on a 4 pin header in most cases.
You can also use a
molex to fan cable adapter and not connect the fan to the motherboard at all. If you do this, the fan always gets 12v and will always be blowing wide open.
There are
inexpensive fan hubs that do the same thing. With this product you can connect up to 10 fans, but they'll always be blowing wide open.
You can also buy a fan controller, which can either be PWM or voltage controller. I bought this one:
NZXT Sentry Mix 2This will take power from one or more molex connectors from your power supply and send it to your fans. You plug your fans up to the controller, and you adjust the speed of the fans by moving the sliders up and down.
There also fancier setups involving PWM, but I don't really know as much about those. They involve using a special PWM splitter on a PWM fan header and spreading that signal to all your fans, and all fans are essentially controlled by the motherboard PWM settings.
Bottom line, to me at least, is how much noise you want. If you don't care about noise, just buy a fan hub and let it rip. If you want them to be quieter, you can either buy a fan controller, or you can hook them up to your motherboard and adjust the voltage through software on your computer.
EDIT TO ADD: I have the motherboard you are interested in and it only has ONE pwm header for the CPU fan, everything else will be voltage controlled.