Question High temperatures on Gigabyte Aorus 1080ti waterforce

Mar 30, 2020
Hello guys! I have a problem with my Gigabyte Aorus 1080ti waterforce, it is warming too much and too fast(actually this is what I think because I am not a pc expert). The most certain thing is the GPU gets temperatures around 90 degrees Celsius(this was the highest value that I could take). This is happening only when I play games, but is happening in any kind of game, from Cs:Go to Hitman 2. I should mention my LG monitor has a 2160x1080p(2k) and in this resolution I run every game. So because of this high temperatures I have lag, but the lag comes after very high temperature maybe a little bit over 90 degrees. At this temperature the cooler is getting crazy and is running with 3000 RPM or around it. I have this GPU for 1 year and a half and I never changed the thermoconductive paste and I never cleaned the dust from it. If I should change the paste what kind of paste should I use? THANK YOU SO MUCH!!!