Power design aside, the 6-pin connector is for OverClock stability.Polako trenutno desifrujemo.
I was running mine with just the 8-pin at stock, and everything was great - as it's supposed to be. I couldn't stably overclock to 1500 like that though. Of course there is really no need to, but for fun I plugged in the 6-pin and 1500 is easy. I'll check how much further it can go - eventually.