Question about my PSU...

Just wanted to ask question about my PSU.

My PSU OCZ modXstream pro 700W
http://www.ocztechnology.com/ocz-500w-700w-modxstream-p...

and my GPU :
http://uk.asus.com/Graphics_Cards/NVIDIA_Series/ENGTX56...

Now, recomended power supply for this card is "minimum of 550W ( with 12V current rating of 38Amper )

I wanted to know how it works, cause my PSU's got 2 rails 25A, since GPU is powered by
2 x 6pin external cables, common sense tells me that manufacturer of that PSU placed both of those 6 pins on separate rails?

So if my PSU has got 2 x 6pins for PCI express and 2 rails of current 25A, are they separate ?