Power Supply suffecient for GTX 570?

Hello,

I'm currently planning on buying a GTX 570. According to the information that I have found, the GTX 570 requires at least 550W and a minimum 12V current rating of 38A.

I'm currently using this PSU:
http://www.newegg.com/Product/Product.aspx?Item=17-371-...

Output: +3.3V@25A, +5V@25A, +12V1@25A, +12V2@25A, +12V3@25A, 12V4@25A, -12V@0.5A, +5Vsb@3A

I'm unaware of how the amps work. Do I simply just add up the two connecting 12v volts with 25 amps each for a combined total of 50, thus making it compatible with the GTX 570?

Or will this not work?