Connecting case fan controller to the MB melted a wire?

Hey. Yesterday I ordered three 12V Evolveo C1 rgb case fans and a controller. However, what I didn't notice is that the online store accidentaly sent me 5V fans (since the packing was exactly the same I simply didn't realize...).

I plugged the fans to the controller and the controller to the molex and the motherboard (MSI x370). Once I turned on my computer, I smelled something weird and realized that the wire to the MB is melted completely. I turned off the computer and PS, unplugged the wire to the MB and when I turned on the computer again with the melted wire removed everything worked fine - no visible damage, both fans and computer worked simply being connected to the controller through the molex. I guess this was caused by the fans being "only" 5V" while I needed 12V fans, right?

So, I'd like to ask - I still have the fans connected and they work fine. Is there anything that could happen or any risks? Or should I use my old fans instead? Since I'm not an expert, I don't want my PC to burn completely or anything.

Thanks in advance. Veronika.

Yes... To get the same cooling power or rotational speed from a 5V fan then the current has to increase. And it's current that fries wires (does the work), not voltage as most people think.

The formula for power is P = I × V. So to get the same power with lower voltage means current has to increase.

I would get the right fans then replace the wire and you should be good to go.

Soapm said:

Yes... To get the same cooling power or rotational speed from a 5V fan then the current has to increase. And it's current that fries wires (does the work), not voltage as most people think.

The formula for power is P = I × V. So to get the same power with lower voltage means current has to increase.

I would get the right fans then replace the wire and you should be good to go.

Thanks for the reply. The fans aren't connected to the mobo at all right now. Just the PSU throught the molex with this: http://www.evolveo.com/ch/rgb-contr-c1 .

So my question is can they stay connected like this with no risks?

Kaesgaan said:

Thanks for the reply. The fans aren't connected to the mobo at all right now. Just the PSU throught the molex with this: http://www.evolveo.com/ch/rgb-contr-c1 .

So my question is can they stay connected like this with no risks?

Sorry, I'm not familiar with it so not sure.