Legit came across a picture of a single-slot GeForce GTX 670 video card from Galaxy.
It's an odd looking beast, with the power connectors almost in the middle of the top edge of the card, plus a very long length to allow the slim cooler to have enough cooling capacity to cool the GK104 GPU and surrounding components. It also appears to have a power LED near the backplate, which might prove useful in troubleshooting situations.