Question 2 Pin to 4 Pin on video card

[kellyon]

Sup. I need to connect a cooler with 4 pins, but the video card has a connector for only 2 pins (although the other 2 slots empty?). Can I make a 4 pin connector out of this? I'm a complete noob. Thanks.

https://imgur.com/a/V8YBBk3

View: https://imgur.com/a/V8YBBk3

 

[Lutfij]

Welcome to the forums, newcomer!

What is the make and model of the GPU? IMHO, since you're here asking about if it can or cannot be done, would mean you shouldn't be doing it. Best stick to a cooler that's made for the GPU imaged...or a fan off of Aliexpress at the very least.

 

[Avro Arrow]

Yeah, don't swap coolers unless you know exactly what you're doing. The new cooler might seem to fit but, as you have learned, the fan connectors may not work. There's also the fact that some coolers won't cool your VRAM correctly which can kill your card.

 

[kellyon]

Thanks guys, this is the GTX 750 Ti by Palit. Actually this is not my main card, I won't be too upset if something happens. I just wanted to know if it's even possible.

 

[Zerk2012]

Thanks guys, this is the GTX 750 Ti by Palit. Actually this is not my main card, I won't be too upset if something happens. I just wanted to know if it's even possible.

What cooler?
You really only need a positive and a negative to make a fan run.
With a volt meter to find the +&- pin out and matching it to a fan it should work.
Edit if the fan went out on the cooler and your trying to use another fan I would probably hook it up to the motherboard and make it run full speed.

 

[Eximo]

You don't actually have to wire the fan to the GPU. If you are using a case fan, just leave it plugged into the motherboard. In a decent BIOS you should be able to set your own fan curve based on the GPU temperature.

I don't think there is much chance of the VRMs overheating on a card like that. Given it likely has/had an aluminum extrusion with a downdraft fan on it just air cooling the naked VRMs.

Not even any supplemental power connectors.

Do you still have the original fan, it should have voltage and power listed on it (Volts DC and Current in Amps). Also you can harvest the connector from it.

So you need to match the voltage and power, otherwise you risk overloading the fan power in the GPU.

For simple fans you just need to wire up the power and ground.
3-pin fans are PWR, Ground, and RPM. 4-pin fans are Pwr, Ground, RPM, and PWM. PWM fans default mode is ON, so if you apply power to a 4-pin PWM fan with no PWM signal, it will run at full speed.

Many fans are color coded, so red to red, black to black, or you can look at the below diagram.

https://www.techpowerup.com/forums/attachments/4-pin-fan-wiring-diagram-basic-electronics-wiring-diagram-jpg.159557/

If you are talking about a 4-pin Molex connector, Yellow is 12V, Black is ground (2), and Red is 5V.

 

[kellyon]

I had an idea to get this cooler https://www.techpowerup.com/gpu-specs/geforce-gtx-645-oem.c2359
I don't know if it will fit, but it looks like the cards are made on identical PCBs and the holes match perfectly. The only reason because I'm interested is PWM, so the fan won't run at full speed. Connecting to motherboard is a big no.