PSU 8pin connector heat up and melted

Basically this is what happened.

When you overclock your cpu two things happen.
Where the eight pin plugs into the motherboard four of them are used for an extra power phase to drive the cpu via voltage regulator modules.
The amount of watts and amps needed to keep the cpu stable when you decided to overclock it cause more power demand.

Wire is made by lots of strands of copper.
How many strands used in a wire relate to how much voltage, or amps the wire can carry.
Any copper wire is made on the AWG gauge, where the numbered value on the wire relates to how many separate strands are used and the thickness of the overall copper wire.

If you try to pass a high voltage, or amp rating, or wattage down a thin cable.
The electrons traveling down the wire bunch up, or bottle neck due to the thinness of the wire.
Where as if the the diameter,or the amount of separate copper strands used in the wire are more it allows more current, high voltage to flow much more easy at a faster rate and the electrons do not bunch together.

When the electrons are packed tightly together they have nowhere to go and bump into each other, rather than flowing in the same direction intended around a circuit from positive to negative . This causes heat as a waste product.

And why the wire and the plug when you look at it may be melted on four of the pins of the eight pin power block.

The voltage, wattage or amps sent down the cable due to the demand or power being drawn by overclocking the cpu from the motherboard exceeded what the wires could safely deal with so they melted.

Think of electrons like water flowing though a tap, the more you open the tap the faster the water can freely flow.
But if you turn down the tap the amount or stream of water that comes out of the tap slows down and come out at a much slower rate.

So the thinner a wire is in AWG rating the less electricity can flow down that cable.
Electrons flow slower and bunch up resulting in heat generated as a by product..

Make the cable larger in diameter with more copper strands, electrons flow faster and more easy.
The cause very cheap wire used with a very poor AWG gauge to keep production costs down.

Buy a better branded PSU and the wires will be thicker in diameter, and the power supply will be of a higher wattage and amp rating for 12v power = no more fire hazard.

People may moan about the price of a branded power supply tier rated. and at a higher wattage output.
But it`s cheaper than having to buy a new house due to fire damage, because you opted for a cheap power supply isn't it ?