I have a 2080 Ti FTW3 ultra and noticed that in game the MEM temps were almost always higher than GPU temps. Usually GPU temps were 60+ C and MEM temps 80+ C. It seems that in Precision X1 all three fan curves are based on GPU temps only. As a workaround I manually set more aggresive fan curves for 2nd and 3rd fans. I think it would be really nice if we could set the 2nd and 3rd fan curves based on the actual MEM temps, especially cosidering the card already has all the extra sensors in place.