Jump to content

GPU fan - 2 pin cable with resistor

Dogway
By Dogway
in Cooling
 Share
Posted

Hello, I would like to know if there's such thing as a 2 pin to 2 pin cable with resistor, or a 2 pin to 3 pin cable with resistor.

This is obviously for the 750 Ti GPU fan since it's slightly noisy.

 

Another option would be a 2 pin to 3 pin cable, then a 3 pin to 3 pin LNA cable that I already own, but looks like clunky plugging too many cables together...

 

This is obviously due to my lack of knowledge in cutting wires, soldering and stuff... so if I can avoid this all the better.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Yes, to raise it only. The fan is noisy at idle, at 40%, it can't go lower.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

3pin to 2pin adapters can be found at moDYI and maybe other places too.

^^^^ That's my post ^^^^
<-- This is me --- That's your scrollbar -->
vvvv Who's there? vvvv

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

How do I control the speed of the fan with that? It's a 2 pin fan, so I have no RPM nor duty % feedback.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

How do I control the speed of the fan with that? It's a 2 pin fan, so I have no RPM nor duty % feedback.

 

It's not the best solution so you wouldn't know, it's bacillary manual control or software control via your motherboard and a temp sensor hopefully on the GPU. For GPU fans they don't have RPM readings the RPM you see is usually an estimate of what the RPM will be based on the voltage being provided to the fan since they know it's characteristic or profile.

 

As you said a resistor will work and is probably the best situation if you still want the GPU to be the device that monitors and controls the fan speed adaptively.

Updated Modding FAQ

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Sorry, I got a bit lost with your post.

What cable with resistor do you recommend then?

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Sorry, I got a bit lost with your post.

What cable with resistor do you recommend then?

 

Last time I took a look at low noise adapters for fans I think it was most resistors they use are between 10-100Ohms, but it really depends on how many amps (current) the fan uses and the voltage that the fan runs at. Personally I'd make a custom adapter if you don't want to splice into the original fan cables, since I've only seen 3 pin low noise adapters.

Updated Modding FAQ

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

It's tricky...

If I put a resistor that halves the power/speed, I get a nice 20% RPM in idle, but then a max of 50% which is too low.

Maybe a resistor that only reduces the current to 30% could be better. But then I'm not sure if at 30% duty cycle it is quiet enough...

Maybe swapping the fan to a 3 pin one might be a better idea...

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

It's tricky...

If I put a resistor that halves the power/speed, I get a nice 20% RPM in idle, but then a max of 50% which is too low.

Maybe a resistor that only reduces the current to 30% could be better. But then I'm not sure if at 30% duty cycle it is quiet enough...

Maybe swapping the fan to a 3 pin one might be a better idea...

 

If you change the fan or the connector to a 3 pin it will give more options on how to control the fan, but low noise adapters, or using software to control the fan is your best bet.  :)

Updated Modding FAQ

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

But simply a 2 to 3 connector won't give me any control right? since it has no RPM feedback, speedfan won't detect the fan and hence I will lack control, or am I wrong?

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

But simply a 2 to 3 connector won't give me any control right? since it has no RPM feedback, speedfan won't detect the fan and hence I will lack control, or am I wrong?

 

I'm not too sure about speed fan's software but you can run fans without RPM feedback it will just be a voltage controlled fan, that's what most bay fan controllers do that don't have a RPM reading just some knobs.

Updated Modding FAQ

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Yes, but then, how are you supposed to control a voltage regulated fan?
In other words, if speedfan can't detect the fan, how do you tell it to spin faster when GPU is hot? I'm trying to wrap my head around it since all sounds so confusing.

Link to comment
Share on other sites
Link to post
Share on other sites
Posted

Yes, but then, how are you supposed to control a voltage regulated fan?

In other words, if speedfan can't detect the fan, how do you tell it to spin faster when GPU is hot? I'm trying to wrap my head around it since all sounds so confusing.

 

That's an issue which is a downfall of using speedfan since it wasn't intended for something like this, I personally would suggest the low noise adapter method since it doesn't change how the cooling system on the GPU works but only lower's it's max cooling capacity and the noise on the low end. It's the easiest amount of work for the most effective gain.

Updated Modding FAQ

Link to comment
Share on other sites
Link to post
Share on other sites
Posted
  • Author

Yeah, problem is with a LNA cable I need a 2 to 3 pin adaptor then the 3 pin LNA cable to mobo.

I think I might buy a third party 3 pin fan and call it a day...

 

Thanks for the help

Link to comment
Share on other sites
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing Cooling

×