It seems that the card is faulty or the fan on it is not working well.Try to use EVGA precision to increase the fan speed and if still it overheats , you can try to reapply thermal paste if it is not covered by warranty.
I did increase the fan speed to 90% (using the EVGA precision) which decreased the temperature to 57 on load, BUT still the PC crashes when I start any 3d game or even refresh windows 7 experience index,
Also the GPU usage does not exceed 98% (as shown on EVGA precision)
You might be out of luck as the card was probably faulty so they gave it to you. If you are looking for a replacement you could pick up a 6670 ,which would be a lot better than what you currently have. This card would not require a extra power connector.