I have an XFX Semi Modular 750W PSU and the cables that are already attached to the PSU are the 24 pin motherboard cable and also has an 8 pin cable that is split in half with 4 on each side. On the PSU there is also a CPU header that I can plug another 8 pin CPU cable into, but since in the attached cables already has an 8 pin that is split with 4 on each side, I plugged that in instead of using the other cable that says CPU.
My PC is working fine so should I be worrying about anything?
Is that 8 pin the correct one?
I don't understand why it has an extra CPU header power cable if there is already an 8 pin attached to the PSU. And it is not the PCI cable.
You did it correctly, the extra is exactly that, extra.(optional)
Ok because the cable that is already attached to the PSU doesn't say CPU or anything on it, it's just an 8 pin split with 4 on each side and the modular cable that is inside the box is actually a full 8 pin that is fit together (not split) and it actually says CPU on it.