Thx Spoony and Necrosan. My post added some humour to the eggs post above and we got a real live-wire response.
I'm gonna lay it out for you "xmanrigger". The power plane is shared. The 4 pin adds supplementary power, of use for extreme overclocking. Generally LN2 level use or crazy Prime running circa 5GHz and above. If you want to plug in both go ahead - IT WON'T HURT.
I won't bother commenting on what I do and don't test, it's juvenile to respond to such bombastic statements. However, I'll take it from you and put it down to lack of experience and a hot-blooded temperament. But if I see anything even remotely close to that levelled at a member, your time here will be short-lived.