GTX 470 Power Pins

You have to use two 6-pin connection for it to work.

If you go SLI you will need four 6-pin connections to power the two cards - if you don't have enough 6-pin connections... the GTX 470 usually comes with at least one or two power adapters to convert your other cables with power connections into a 6-pin connection.

I bought two GTX 470 the past two months and they both came with adapters in case I don't have enough 6-pin connections...

Your main concern should be if your power supply and if it can handle two GTX 470s...