Motherbpoard atx 8-pin trips psu but 4-pin works

Hi there, I usually can find all the info I need here but this has me stumped.

My PC decided not to turn on. Ruled out psu, then bread boarded. There were lights on MB reset, power on and bios but nothing else. The MB would power on without the cpu powered by atx 8-pin (and needed help with a hairdryer) I thought the cpu or MB was dead but as a last chance I plugged the 4-pin atx cable instead of the 8-pin and it came to life, posted and got to bios. What could be the problem?

Thanks

Asus Rampage 4 extreme, i7 3820
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