Originally posted by bum
On newegg if it says it has dual 12v, that pretty much means its SLI ready, Nvidia just didn't put their seal of aproval on it for whatever reason. However not all cards need it. Mine takes regular 4 pin connectors so I don't need anything special.
No, no.. that's not how it works. I have a dual-rail PSU that came with a 30$ case, and is by no means SLI ready.
Dual-rail means there is two 12v circuits. It's basically as simple as that.
It's like having two breakers in a fuse panel. One would easily overload if you put too much strain on it. The same with PSU's. You can't provide enough amps to run everything required, so, they made an additional 12v rail to provide more amps and to provide more headroom for more devices.