Well the computer turns on fine, and I have faith that's the second card has enough power, however the first card, a gtx 570, I'm a little bit more weary of putting it under load.
My understanding of the rails stated that both pci connectors share a 22 amp rail. Being 12 volts, I'm thinking that it will be able to handle about 264 watts. In addition the pcie slots in the motherboard bring out 75 watt each.
If it evenly splits, im worried, if it intelligently splits I'm golden.