Stupid question, but did you open the card and scrape the excess thermal paste off? That will help a ton. I cracked mine open and couldn't believe how much was applied. I reapplied a little bit and temperatures managed to drop 5-10 degrees.
I've done that and tweaked core clock and fan speed and could hardly go over 85 degrees Celsius. It wasn't anything drastic; I just dropped clock speeds by 100mhZ and fan speed down to 75 percent. That depends on where your computer is and how cold it gets.