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3 Pin motherboard fan connector to 4 pin videocard fan connector?

post #1 of 5
Thread Starter 
Dunno if this is the right section for this. Deals directly with air cooling, so I figured this would be the right place to put it.

I have a Zalman 7500cu VGA cooler on my Sapphire HD5770, but the cooler has a 3 pin motherboard header to power the fan. The Videocard itself has that smallish 4 pin header for the native VGA cooler to be powered and controlled by the card and drivers. I also have my old cooler off my deceased HD4850, which won't fit directly onto the HD5770 (which would make this whole question moot) but does have the exact same 4 pin vga connector that the HD5770 has.

The HD5770 is going into a SILVERSTONE Sugo SG03B-F micro-atx mini-tower and the less cable I have to run and the more fan connectors I have free for case fans, the better. Additionally, it'd just be nice to know how to do this for any future aftermarket coolers my cards might end up with.

So the question is this:

Is there any way to splice or re-pin the 4pin connector from the old 4850 cooler in place of the 7500cu's 3-pin motherboard header, and can such a configuration even work (fan control is a bonus but certainly not a must).

Thank you.
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post #2 of 5
I hope that this helps out

HERE
post #3 of 5
Thread Starter 
I really appreciate the link, and that is more or less what I'm looking for. However, I was really wondering if anyone knows the corresponding pins between a 3 pin and 4 pin connector, since I already have a 4-pin connector from an old stock fan. Then I could just make my own right here and now without the need for adapters.

Thanks anyhow, and if no one has the answers I seek your link will come in extremely handy.
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post #4 of 5
Quote:
Originally Posted by GiaA;12201342 
Dunno if this is the right section for this. Deals directly with air cooling, so I figured this would be the right place to put it.

I have a Zalman 7500cu VGA cooler on my Sapphire HD5770, but the cooler has a 3 pin motherboard header to power the fan. The Videocard itself has that smallish 4 pin header for the native VGA cooler to be powered and controlled by the card and drivers. I also have my old cooler off my deceased HD4850, which won't fit directly onto the HD5770 (which would make this whole question moot) but does have the exact same 4 pin vga connector that the HD5770 has.

First off, the Zalman cooler 3-pin fan is voltage controlled. The 4-pin VGA fan header is PWM. If you had the Gelid adapter in your hand, and connected the 3-pin fan to the VGA PWM header using this adapter, the fan would run 100% full speed. It's also very likely there would be no fan speed control, either via software or BIOS.
Quote:
Originally Posted by GiaA;12201342 
So the question is this:

Is there any way to splice or re-pin the 4pin connector from the old 4850 cooler in place of the 7500cu's 3-pin motherboard header, and can such a configuration even work (fan control is a bonus but certainly not a must).

Thank you.

Splicing the wires together will give you the same result as I said above. If you want to splice the wires, here's the pin/wire connections. Let me state again that the fan will (most likely) operate at full speed with no way to control the speed.

3-pin
Black = ground
Red = 12v
Yellow = Tac/RPM Sense

4-pin PWM
Black = ground
Red = 12v
Yellow = Tac/RPM Sense
**Blue or Green or Orange = PWM Sense

**The PWM wire is not used

Your other options...

- Replace with a PWM fan.
- Plug the fan into a free 3-pin MB header (fan control is possible)
- Plug the fan into a fan controller

smile.gif
post #5 of 5
Thread Starter 
Thanks Gymenii, exactly what I was looking for!
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The Mothership
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