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CaptainSpeedster

Controlling molex output?

On 5/6/2020 at 9:34 PM, LIGISTX said:

If they don't have an RPM sense line (they only have molex plugs), not really. What you can do is:

 

https://www.overclockers.com/forums/showthread.php/372297-Guide-to-the-7v-Fan-Mod

 

That guide has you change the fan side wires, so you actually give the fans 7v or 5v instead of 12. So you don't get fan control, but you just run them at a lower voltage and thus lower RPM at all times. 

It would be a little more complex, but another option might be to put in a linear potentiometer to control it, with the knob somehow affixed outside the case. It would be manual control, not automatic, but at least it's adjustable. That's basically what this is, but if you're comfortable soldering you might be able to DIY it cheaper.

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Posted · Original PosterOP

I have fans that are connected with my motherboard for rgb via a splitter, it has 4 6-pins that connect to fans, 4-pin for rgb that goes to motherboard and a molex for power. 

My question here is: can i buy something that would connect to my motherboard and to the molex so that i can control the fans? Currently i cannot change their speed.

The case and mobo in question are CMT520 from FSP and rog b450-e motherboard.

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Posted · Original PosterOP

Welp they were included with the case XD...

I mean they work ok so i dont have a reason to ditch them or money to buy replacements ...

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31 minutes ago, CaptainSpeedster said:

I have fans that are connected with my motherboard for rgb via a splitter, it has 4 6-pins that connect to fans, 4-pin for rgb that goes to motherboard and a molex for power. 

My question here is: can i buy something that would connect to my motherboard and to the molex so that i can control the fans? Currently i cannot change their speed.

The case and mobo in question are CMT520 from FSP and rog b450-e motherboard.

If they don't have an RPM sense line (they only have molex plugs), not really. What you can do is:

 

https://www.overclockers.com/forums/showthread.php/372297-Guide-to-the-7v-Fan-Mod

 

That guide has you change the fan side wires, so you actually give the fans 7v or 5v instead of 12. So you don't get fan control, but you just run them at a lower voltage and thus lower RPM at all times. 


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Posted · Original PosterOP
20 hours ago, LIGISTX said:

If they don't have an RPM sense line (they only have molex plugs), not really. What you can do is:

 

https://www.overclockers.com/forums/showthread.php/372297-Guide-to-the-7v-Fan-Mod

 

That guide has you change the fan side wires, so you actually give the fans 7v or 5v instead of 12. So you don't get fan control, but you just run them at a lower voltage and thus lower RPM at all times. 

Thanks, i was thinking about something similar when asking this question. Il try that when i have time.

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Posted · Best Answer
On 5/6/2020 at 9:34 PM, LIGISTX said:

If they don't have an RPM sense line (they only have molex plugs), not really. What you can do is:

 

https://www.overclockers.com/forums/showthread.php/372297-Guide-to-the-7v-Fan-Mod

 

That guide has you change the fan side wires, so you actually give the fans 7v or 5v instead of 12. So you don't get fan control, but you just run them at a lower voltage and thus lower RPM at all times. 

It would be a little more complex, but another option might be to put in a linear potentiometer to control it, with the knob somehow affixed outside the case. It would be manual control, not automatic, but at least it's adjustable. That's basically what this is, but if you're comfortable soldering you might be able to DIY it cheaper.

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