Originally Posted by AdamK47
42A for a single card... so can 60A for two in SLI cut it?
Seems to indicate that the minimum requirement is 42 amps on the 12v line for the whole system,so that comes to just over 500 watts(504 watts to be exact) for the 12V line,and add that the cards do indeed have a 6 pin+ 8 pin PCI-e power connectors,that can be anywhere from 225 to 300 watts for the card alone.
Aim for a 750~800 watt power supply for an SLI setup if no overclocking is planned on both the cards and CPU,if you are,go for higher end power supplies basically.
60 amps is 720 watts for the 12 volt line,so that might be cutting it too close for SLI setups,as there's still the CPU,motherboard,ram and more to power up.