As mentioned before, 65 is considered pretty much alright considering you're running it on load. It's quite safe, so no need to worry unless you start going up to 90 or such, which will not happen. I have an R9 290 Tri-X myself and it goes up to 70 sometimes, it's natural, I'm not even half worried, I'm actually pretty satisfied with this kind of temperature.
If you have any more questions, let me know. Have a good one.