I would like to knowIf I could offer my advice here...
1,000 watt for SLI is too high, unless you're running a 4-way. Also, I'm pretty sure you can get quad cores at 95w.
I have a real nice ABS Tagan 700w with REMI that supports SLI. It depends exactly which card you're using, but you should be able to run it on 500-600 with ease.
But practically, unless SLI has changed drastically in the last few months - you're wasting your money. You'd get more Performance out of a single, higher-end card, and more compatibility. And you do not want a quad core for gaming..
If you want me to explain "why," let me know.
As to power draw.. Let's go to the safe, high-end and say you average 550w usage. 550 / 12v = 45.8a
As I recall, the A/C on High draws 50-60A.. Correct me if I'm wrong, someone.
The point is, if the car is running (especially if it's Moving), this should be doable. You might need a stronger amp or second amp, if you're not... But I know Much more about computers than I do about cars and electricity, so please don't take my advice without checking it.