Question How do I connect this cable to my motherboard?

Apr 25, 2019
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I am guessing RGB lighting. But, providing us with Phanteks model and a motherboard model would help.

Industry standard RGB-4PIN Adapter Included for synchronization with RGB motherboards.

There are 14 different Phanteks GPU blocks and hundreds of different motherboards.

The mobo is asus prime x470-pro. The block is a
Phanteks PH-GB1080FE_CBKLD_01 Phanteks G1080 GPU Full Cover Water Block for Nvidia 1080/1070 Founder Edition