It's a GTX 960 and I noticed it was very dusty. I took it out to clean the dust as well as applying new thermal paste. The paste I used has a thermal conductivity of 6.5 w/mk and was produced by Duratech. I normally sat on 65C° while gaming on Fortnite however now it's a consistent 80C°. I spread out the paste on my GPU with a credit card and put more on than the 'pea' size. What should I do because it's really worrying me.