I purchased seasonic 1000w platinum SS 1000xp psu to upgrade and it has 12 pin design slot for pcie connection and the cables I have are only 8 pin and there is also an extra slot that supplies power for cpu/pcie that is also a 12 pin design instead of 8 pin, so how do I connect cables to these as the locking slot is in the middle and the custom sleeve cables I have don't have pin at the end, so how do I solve this puzzle instead of buying the cables as I spend around 90$ for these custom sleeved cables, thank you.