I saw that picture and thought that you were messing around... You were really serious! HAHA. How could you know enough to buy a 2080, but not to buy a new case with better airflow?
Never had a heat problem with the last 5 video cards over the 12 years or so. For my part, Just lack of research on the 2800 I guess? No biggie, it'll all be good (I hope) when my new case gets here.
On another random thought, somebody had mentioned the room temperature needing to be cool too? I think if the day comes that we also need our house air conditioned to stop video cards from burning out we'll have reached a high level of insanity
All depends on the GPUs you used. They were probably lower powered GPUs while the 2080 SUPER you have here is rated @ 250w. Basically what the high end GPUs were all those years.
Since you're still on 1080p, I'd make sure to cap your FPS to your screen's refresh rate which should help lower the thermals as well otherwise your GPU will be wasting energy and creating more heat for nothing.
Once you get the 1440p 144hz, you can unleash the beast. lol