Thermal Images
We snapped a few infrared pictures at idle, at regular clocks and at overclock clocks as you can see here. At idle, the center of the card gave us a 73.9 degrees Fahrenheit (23.3C) reading.
While gaming at stock clocks, that increased to 99.8 degrees Fahrenheit (37.7C) and the top exhaust of the card showed 154.9 degrees Fahrenheit (68.3C).
While overclocked, temperatures dropped slightly due to the higher fan speed configured (60% at stock, 80% while overclocked), yielding 87.3 degrees Fahrenheit (30.7C) and 137.1 degrees Fahrenheit (58.4C).