i think opening it and re-cleaning the thermal paste and add new paste would be a good idea but as i have no experience with these type of things i wouldn't want to do it, don't want to broke my card. right now im doing the fan speed thing going from 30% at 40c to 60% at 85c, its not really helping much, but yeah thank you for ur time and ur reply i very appreciate it.
i would like to try lowing the voltage but like i said i have no experience so doing that would be a bad idea if im tweaking it my self.
I did this with my HD 4870, keep in mind that although this isn't very compicated I wouldn't recommend it as it's still a relatively advanced process which voids your warranty at many cases, and I only got the temps down by about 3 degrees which isn't much. The stock thermal paste with gpus is usually good enough to hold for 3-4 years or more.
Since you have the reference card, this isn't overly surprising as the cooling is designed to dissipate most of the heat to the outside of the case using a small radial fan, which also work at high pressure, which leads to higher noise and usually lower cooling capabilities but less heat buildup inside the case.
The other cooling design which most manufacturers utilize is using usually 2-3 bigger fans in an open area and dumping all the heat to the inside of the case. This usually leads to less noise, better cooling capabilities but all of the heat is dumped to the case and usually goes through the cpu which can lead to less overclocking capabilities and hotter components overall.
With your card's type of cooling design, dust is really the enemy so again make sure that the card stays relatively clean from dust.
What do you mean when you say that your back fan is on top of the card? Can you please provide us with your case model?
I think that before trying to undervolt you should follow the steps above so we can make sure that you have an optimal environment for the card.