All GeForce 8600 GTS cards require to be connected to the 6-pin 12volts PSU connector. The card should roughly consume 75 Watts when it peaks with the overclocks.

Guru3D recommends 350 Watts for one card, and 450 in SLI as minimum.

Single slot heatsink fan. Not at all noisy, it surely cools a notch better than the reference cooler. The fan has been moved away from the GPU core opposed to NVIDIA's reference cooler. Let me show you that.

Here you can see the reference design cooler.

Fired up and stress-tested in the test system.