Now if you decide to go the guru path of righteousness (read: Crossfire) then please understand you'll need to connect both the CF bridges, not just one. The Crossfire connectors will be supplied with the graphics cards, by the way. One per card. Hard to spot, the Crossfire fingers are on the upper left corner.

The big-ass' ventilator inside the cooling unit. Dual-slot by the way, so it'll eat up an extra PCI slot. Worth it though, as the heat will be exhausted outside your PC.

Here we have the external power connector. You connect your power supply to these 6-pin power connectors. This cards TDP is roughly 160-170 Watts maximum.

And there she is, doing a good workout in our test-lab.