12V Port Confusion (B450 Aorus Pro Wifi)

So I recently bought the board. Everything seems fine, except when I was connecting my 12v cable from my case(Corsair SPEC DELTA RGB). I looked at the cord and noticed it had for 4 plugins, while the board had 5 pins for that port? I couldn't find any attachment for both the case or motherboard respective boxes. I really like this case and I wanna know if there's any way I can solve this before having to replace it with another one. I have images below if that's helpful. Thank you.

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