There is a way to do this just as you want, despite small limitations of your mobo's fan control design.
First, let's review what all those fan ports on the mobo are for, and can do.
The CPU_FAN port is ONLY for use with the CPU cooling fan. It will control the speed of that fan according to a temp sensor built into the CPU itself. It also will monitor the CPU fan speed and send out an alarm if it fails. These are important functions to use, so don't plug any other fan into this port. Note that, on manual p. 42 it says the CPU_FAN port can be configured to use EITHER a 3-pin or 4-pin fan type (see below for the difference).
The PWR_FAN port is really designed for only one function, although it can be used a little differently. Its INTENT is that you plug into it only a special connector just like a 3-pin fan connector, but coming out of the PSU. Not all PSU's have this output, so if yours does not, your best option is NOT to plug anything into the PWR_FAN port. For PSU's that do have this connection, what it really does is send a signal for the speed of the fan inside the PSU to the mobo so it can be monitored. The mobo does NOT control the PSU fan's speed - if it has any auto control, that is done internally by the PSU itself. BEYOND the design, however, many such mobo ports actually have Ground and +12 VDC supplies on its pins 1 and 2, so if you plug into it a 3-pin standard fan, the fan will run full speed at all times, just as if you had plugged it into one of the 4-pin Molex power outputs of the PSU.
The SYS_FAN1 port, according to the mobo manual on p. 42, will control a 4-pin case cooling fan automatically, using a temp sensor in the mobo to guide it. Now, 4-pin fans have three signals supplied to them. Pin 1 is Ground, Pin 2 is +12 VDC always, and Pin 4 has the PWM signal. The fan itself contains a tiny controller that uses the PWM signal to control how much of the +12 VDC is actually supplied to the motor, thus controlling the speed. Pin 3 is not a signal supplied to the fan motor. It carries a pulse signal generated by the motor back to the mobo to be counted, to yield the fan's speed. Note that control of the fan speed by the mobo does NOT depend on this speed signal - the signal is used for display, and to monitor the fan for failure.
The SYS_FAN2 port is not mentioned much in the manual, and appears not to have any automatic control available. It is for a 3-pin fan. For that fan type, speed control is accomplished differently. The Ground and Speed Pulse lines are still there on Pins 1 and 3, but there is no PWM signal. The +VDC line on Pin 2 is no longer constant - it varies from 0 to +12 VDC to achieve fan speed control. On some mobos, this port also is guided by a temp sensor in the mobo and can do automatic control of the fan it supplies. Your mobo's manual does not claim this, so I can't tell you for sure if SYS_FAN2 will control its fan, or maybe it will only run its fan at full speed.
Note that, for both the CPU fan and the SYS_FAN1 ports, your manual says on p. 42 that you can adjust the details of control using a Windows app called Easy Tune included on the CD that comes with your mobo.
With that background, how can we do what you want? That is, how can we achieve power and automatic control by the mobo for 5 case fans? The usual stumbling block for this is that one mobo fan port may be quite able to power and control TWO fans if you use a splitter, but not more. Why? The limit is its ability to provide enough current for a few seconds at start-up, when any fan motor's current pull is maximum. (By the way, many of the splitters sold make a mistake in my opinion - they connect the fan speed pulse signals from BOTH fans back to the mobo, causing problems for the mobo's speed measuring system.)
The solution to this is a special adapter for 4-pin fans only, so you would have to buy ALL 4-pin fans for your 5 case cooling units. The adapter is shown here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812119248
HOWEVER, it is Out of Stock there (and on Amazon.com), so I'm not sure where you get them.
You would need 2 of these to do what you want.
First, let's look at what it does. It has one male connector of the 4-pin Molex power type. This plugs into a Molex power connector from the PSU used commonly to power older IDE devices, but in this case it only actually uses the Ground and +12 VDC supplies - these are the Black and Yellow wires going from it to the three output connectors. The PSU output line has lots of current capacity - easily enough to start and run several fans from one Molex connector. The adapter has one female 4-pin connector that plugs into the mobo 4-pin CPU_FAN port. It is wired so that it supplies NO power to any fan - all the fans are powered from the PSU via the Molex connector - so the mobo port's current limitations no longer apply. It connects the Speed Pulse signal from only ONE of the output connectors back to the mobo for monitoring. But it supplies ALL of the output connectors with the PWM signal from the mobo port. Now, the little controller chips inside the 4-pin fan motors draw VERY little current from the PWM signal line, so many can share that signal. The adapter has 3 output connectors, of which only one has a connection to its Pin 3 for sending its speed signal back to the mobo.
In the original design concept for this adapter, that one special output connector was labelled to go to the CPU fan, and the other two to case fans. In this way the automatic control system in the mobo for the CPU cooling fan could be used to control THREE fans, not one, all based on the temperature sensor inside the CPU. Control is achieved by sharing the PWM signal, but actual power to each fan is not from the mobo - it's from the Molex output from the PSU. Note that the CPU fan's speed is the only one sent back to the mob CPU_FAN port to be monitored - the speed signals from the other two fans are just ignored. Also note that this only works if ALL 3 fans are of the 4-pin type that is controlled using the PWM signal.
Now, let's depart from the original design intent. Suppose we get two of these and hook them up this way.
1. First adapter is connected to a Molex power output from the PSU, and its mobo connector goes to the mobo's SYS_FAN1 4-pin port - NOT the CPU fan port. That will put its fans under the control of the automatic SYS_FAN1 system based on a temp sensor in the mobo, NOT in the CPU. The real CPU cooling fan is connected to the mobo's CPU_FAN port to operate normally.
2. Now we connect the second adapter in a specific daisy-chain manner. It power supply again comes from a PSU 4-pin Molex output. (This could be a different output if it's available, OR you could actually use a 2-from-1 splitter on a single 4-pin Molex output line from the PSU.) The female 4-pin connector intended to plug into a mobo port is connected, instead, to the special male 4-pin output line from the first connector that has the green speed signal wire to it, and the "CPU Fan" label. Thus ONE of the fans on this second adapter will become the only case fan in the system whose speed is actually monitored.
3. That leaves 2 output connectors from each of the 2 adapters available for powering the 4 other 4-pin fans you have. Presto, all 5 of your 4-pin case ventilation fans are being controlled automatically by the SYS_FAN1 port, based on actual temperature somewhere in the mobo. The are all getting their power from a fully capable supply direct from the PSU, but their control is from the mobo SYS_FAN1's PWM signal they all share. The CPU is being cooled completely separately by its own cooling fan, which is also under automatic control by the CPU_FAN port as normal.
Now, you should realize that only one of the 5 case fans here is actually being monitored for speed and failure. None of the other four are monitored at all. So, it will be up to you to check on all your case fans from time to time to be sure they are working properly.
Biggest problem in all of this is: where to get those adapters?
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