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Controlling molex output?

CaptainSpeedster
By CaptainSpeedster
in Cases and Mods
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Go to solution Solved by fordy_rounds,
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.

Posted

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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https://linustechtips.com/topic/1190368-controlling-molex-output/
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dude. you should just ditch molex fans. how did you even get molex fans with RGB?

We can't Benchmark like we used to, but we have our ways. One trick is to shove more GPUs in your computer. Like the time I needed to NV-Link, because I needed a higher HeavenBench score, so I did an SLI, which is what they called NV-Link back in the day. So, I decided to put two GPUs in my computer, which was the style at the time. Now, to add another GPU to your computer, costs a new PSU. Now in those days PSUs said OCZ on them, "Gimme 750W OCZs for an SLI" you'd say. Now where were we? Oh yeah, the important thing was that I had two GPUs in my rig, which was the style at the time! They didn't have RGB PSUs at the time, because of the war. The only thing you could get was those big green ones. 

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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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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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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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