i also wrote safe temp i didn't wrote okay or danger i wrote safe temp
safe temp when idle it will be around 35-42C it is safe can you imagine if it go higher the 50 at idle load what will be the temp on load.
safe temp when load it will be around 55-60C it is the safe temp on load if it go higher then 65C it could damage the card.
I know because because experianced it.
I also had a GTX 465 it goes just 70C and in 6 month approx. it stopped working. I go to the service center they said you card is fried and the repairing cost is 4600INR and if i buy a new card it will be 9800INR.
I'm saying you're mis-informed. almost every GPU on the market have a temperature ceiling of 105. some people will say up to 95C can be a safe temperature. there is absolutely NO WAY 65C is a bad temp.
first of all, the OP is asking about a 6870, which is different from your 465 in many ways (including Nvidia vs AMD). that aside, It's likely your 465 fried because it was a lemon/damaged during shipping, or the cooler was poorly designed, which usually means they didn't put on a heat spreader on the VRM, or the VRM heat-spreaders fell off, causing the VRM to overheat (that can go to like 120C without heat spreaders)...