High temperature risk present.
High temperature risk present.
I understand you need more details about the 3-pin header. Could you clarify where the pump power is connected on the motherboard? That will help me get a clear photo and confirm the exact location.
Your pump, attached directly to your CPU, should have two cables connected. One is clearly the thicker USB cable, which connects to a USB 2.0 header on your motherboard. There’s also a smaller, three- or four-pin cable that leads to a fan header. The setup will resemble this diagram.
I've examined the photo of your motherboard. I'm searching for the necessary cables and will get back to you with the details.