No, its refined to cards that run on non-nvidia motherboards. nTune and the like cannot communicate sufficiently. You need to update bios. Thats the solution.
A 2 - 3 oC change is like farting into the wind. The thermo-sensor has a tolerance lower than that. IF you are going to put a 70mm fan in there, it SHOULD drop the temp more than 10oC. BUT it will make a hell noise. The bigger the fan, the less noise generally. The card is fine. Update the bios.
Mine idles at below 40oC and peaks at about 75oc. This is normal for this Gen2 card with the architecture it has.
Trust me, update your bios, and the fan will do the rest.