I let it test for 12 minutes, and it hit a max of 80c. I know that 80, or even 85c, is quite a bit below the thermal limit of the card, so I'm not even remotely worried.
But as for the reason why it hits 80c, probably because my fan sits at around 55%.
Yes, you'r below thermal limits. Don't worry about it. Some GPU work good on 100c without a problem...
But question is, why in FurMark temp reach 81c?
I don't think that is about fan, but try with 100% speed...
Also be sure that in FurMark you will got higher temp than after gaming. You'r temp is higher just for couple degrees, nothing serious..
Are you sure that this card is not overclocked?