OPT-Fan Header
- Thread starter DarrenD
- Start date
Depends on your motherboard. Most have the same settings and profile options for all fan headers but some have more for the CPU and streamlined versions for the others. To be safe, if the CPU fan header is free then just use that one.
Having said that, the fan profiles in most motherboards is limited. I'm not convinced it's a good idea to constantly change the speed of the pump based on fluctuating CPU temperatures. The CPU temperature can change wildly multiple times per second. Even with polling usually at 1Hz it can fluctuate a lot. I tried custom fan profiles on my Asus Formula VII and the fan was all over the place so reverted to one of the static profiles. Or do you plan to use Speedfan or similar to control it via software?
Having said that, the fan profiles in most motherboards is limited. I'm not convinced it's a good idea to constantly change the speed of the pump based on fluctuating CPU temperatures. The CPU temperature can change wildly multiple times per second. Even with polling usually at 1Hz it can fluctuate a lot. I tried custom fan profiles on my Asus Formula VII and the fan was all over the place so reverted to one of the static profiles. Or do you plan to use Speedfan or similar to control it via software?
I have not considered yet what software to use, thanks for the info, I will look into what software is recommended, I have a Bitfenix Recon 5 fan controller (which has its own software the reviews are not very good though) for the 5 fans in the case, 2 intake, 1 for the 140 Rad and 2 for the 280 Rad but still have time to change the 2 intakes Fans to the MB fan Headers and the pump be controlled by the Recon fan controller
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If your CPU_OPT has 'Speed control' marked on Pin 4 then it is a PWM controlled connector. If it says VCC, 12V, 5V or pretty much anything else for pin 4 then it isn't a true PWM connector. If it only says Speed control on 2 then it is a voltage controlled header.
A lot of the time the only PWM enabled header is the CPU. I'm not sure why motherboard manufacturers do this. Surely with so many PWM fan and pump options why limit the PWM controller to just the CPU Fan.
I have a Recon controller, have had it for many years and it's been years since I've actually touched it. It just works, then I have just 3 pin fans attached to it. I'm not sure whether it'll work very well for a PWM pump, especially one that draws up to 23W and is fitted with a Molex connector.
If you only have one PWM source then you could split this with a splitter cable.
A lot of the time the only PWM enabled header is the CPU. I'm not sure why motherboard manufacturers do this. Surely with so many PWM fan and pump options why limit the PWM controller to just the CPU Fan.
I have a Recon controller, have had it for many years and it's been years since I've actually touched it. It just works, then I have just 3 pin fans attached to it. I'm not sure whether it'll work very well for a PWM pump, especially one that draws up to 23W and is fitted with a Molex connector.
If you only have one PWM source then you could split this with a splitter cable.
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