Thanks OP.. I've been scrounging for info on this.
One 8-pin is required, while the other will accept a 6-pin or an 8-pin, depending on overclocking goals. Very nice. They plugged in two 8-pins and only took it to 1000MHz. I wonder if that can be accomplished with one 8-pin and one 6-pin. Dual 8-pin is prolly geared for big water/LN OC's. I'd want to retain 5870's good power envelope and see what core can do with one 8-pin and one 6-pin.
I hope the pricing sticks!