These cards usually have really good cooling, especially on a card of this caliber as long as you have fans for your other parts in your system you should be fine. Your card should never go above 75+ degrees celsius under full load as long as its below that that's a safe threshold they can handle 80+ usually, but as a rule of thumb 75 or less is the way to go for full load.
As xasylum said, as long as your case cooling is good, it will be fine. I agree about keeping it in the 70s under load too. Test it with some games (MSI Afterburner is a good app for that) and record the temps. If they are higher, then you need more powerful case fans.