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The GTX 470 needs only two 6-pin PCIe PEG connectors, and power supply wise you are looking at a 550W PSU. You can see two SLI fingers that allow for a total of three cards to be setup in SLI.
Here you can see the cooling a tad better, heatpipe based leading to aluminum fins and then three low RPM fans to blow away the heat. Unfortunately a lot of residual heat will be dumped inside the chassis this way. Thus make sure you establish a proper airflow in your PC.
One last photo, here it is armed and activated in our test setup. Despite what you might think, this card is silent .. oh so very silent.