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As stated the typical Boost Clock speed is 1089 MHz. The Boost Clock speed is based on the average GeForce GTX 670 card running a wide variety of games and applications. That Boost clock will vary from game-to-game depending on certain power conditions/envelope, we've seen it clock to roughly 1100~1150 MHz most of the time. The card is PCIe gen 3.0 compatible. Going from PCIe Gen 2 to Gen 3 doubles the bandwidth available to the add-on cards installed, from 500 MB/s per lane to 1 GB/s per lane.

The GeForce GTX 670 has a maximum power consumption of roughly 200 Watts, the typical power raw will actually be a good notch lower. You'll need to power the card with two 6-pin PCIe PEG lead from your power supply. Due to the small PCB the connectors look a little oddly placed, but that is because the cooler is longer than the actual PCB.

Power supply wise we recommend a 550 power supply to start with. With one card that is. 

Here you can see two SLI connectors, the 670 series is allowed to work with up to four cards in Quad SLI mode. For proper scaling and little driver issues as possible we always recommend to stick to 2 cards in multi-GPU mode