Both Geneo and jab383 are correct.
Asus and most manufacturers, only have one true PWM fan header, CHA_FAN (CPU_OPT is only a mirror none controllable, just a mirror of the CPU_FAN). The rest of headers CHA_FAN 1,2,3 even though they are 4pin physically, they are are voltage controlled or what some called fake 4pin.
So just chose careful the fans for each header, all will be binded to the CPU temperature, so really dont matter which you chose, you can controlled them individually, but its important that you dont place PWM fans on CHA_FAN headers, in some cases, they are unstable, to the point even with the FanXpert2 tunning, the lowest voltage is not stablish correctly and in some cases (depending on the fans), they stop.
First check if your pump is PWM or not, if it is use the CPU_FAN header for it. For the rad and case fans, my suggestion is go with Scythe Gentle Typhoons AP15, Asus motherboards with FanXpert2 can take them extremly low or ramp it them up to their max rpms, so you have a very wide range of operation. I leave you a run on GT AP15 on my GENE,
Now if you want to go PWM fans, then you have an issue if you pump is PWM, as asus motherboards only have 1 true pwm fan header (even though you do have a mirror on the CPU_OPT), the problem is that even if you use a PWM splitter, the fans and pump will be ran the way the main header will be, and you wont be able to control them seperated, if you wish to go with pwm fanns then go with a none pwm pump, thats if you wish to control them individually.
Asus and most manufacturers, only have one true PWM fan header, CHA_FAN (CPU_OPT is only a mirror none controllable, just a mirror of the CPU_FAN). The rest of headers CHA_FAN 1,2,3 even though they are 4pin physically, they are are voltage controlled or what some called fake 4pin.
So just chose careful the fans for each header, all will be binded to the CPU temperature, so really dont matter which you chose, you can controlled them individually, but its important that you dont place PWM fans on CHA_FAN headers, in some cases, they are unstable, to the point even with the FanXpert2 tunning, the lowest voltage is not stablish correctly and in some cases (depending on the fans), they stop.
First check if your pump is PWM or not, if it is use the CPU_FAN header for it. For the rad and case fans, my suggestion is go with Scythe Gentle Typhoons AP15, Asus motherboards with FanXpert2 can take them extremly low or ramp it them up to their max rpms, so you have a very wide range of operation. I leave you a run on GT AP15 on my GENE,
Now if you want to go PWM fans, then you have an issue if you pump is PWM, as asus motherboards only have 1 true pwm fan header (even though you do have a mirror on the CPU_OPT), the problem is that even if you use a PWM splitter, the fans and pump will be ran the way the main header will be, and you wont be able to control them seperated, if you wish to go with pwm fanns then go with a none pwm pump, thats if you wish to control them individually.
The chassis fan headers are controlled by seperate profiles in either BIOS or AISuite, but all three profiles are based on the CPU temperature sensor. In that they all depend on CPU temperature, they are not "independent channels." The M6E and M6F have OPT_FAN headers in addition to the CPU and CHA headers. For each OPT_FAN header, there is an OPT_TEMP header. When a temperature sensor is plugged into the OPT_TEMP header, that temperature can be used to control the corresponding OPT_FAN.
Each fan header can drive up to 1 amp. Any fan, or combination of fans on a splitter cable, that totals less than that can be connected. A common approach is to use the sort of splitter cable that draws power from a PSU molex and connects only the PWM and tachometer leads to the MB header. I have pump and radiator fans on that sort of connection now.
In your liquid cooled setup, plan on connecting something to the CPU_FAN header. That's to prevent BIOS from hanging in an alarm condition over the lack of CPU cooling. Radiator fan PWM and tach are good choices. I've put the pump tachometer on that header when fans were all controlled elsewhere.
Jeff
Each fan header can drive up to 1 amp. Any fan, or combination of fans on a splitter cable, that totals less than that can be connected. A common approach is to use the sort of splitter cable that draws power from a PSU molex and connects only the PWM and tachometer leads to the MB header. I have pump and radiator fans on that sort of connection now.
In your liquid cooled setup, plan on connecting something to the CPU_FAN header. That's to prevent BIOS from hanging in an alarm condition over the lack of CPU cooling. Radiator fan PWM and tach are good choices. I've put the pump tachometer on that header when fans were all controlled elsewhere.
Jeff
That's what ASUS says. I've connected two 140mm to one header plus three 200mm each to their own header. Each controlled header would have its own MOSFET -- that's what sets the limit -- so the stresses are supposed to be independent. They do depend on having the 8-pin PSU connection.
Jeff
Jeff
