this.
"specific models"
suprim x 3080ti, 3090 and 3090ti are almost the same in size
3080ti: 336 x 140 x 61 mm (400w)
3090: 336 x 140 x 61 mm (420W)
3090ti: 338 x 140 x 71 mm (480w)
same coolers for both 3090 and 3080ti minor difference to 3090ti. so 3080ti's on suprim x are very cool. 3090 are cool enough, then plus 1cm for 3090ti to be cool enough.
people are just buying the cheapest model and run them..if you live in a cold climate then yes, you have that option. but then again there are such issues to the types(brands that don't perform compared to other brand ex. hynix, samsung, micron) of memory used in cheaper models (this is not always the case, there are times you can still get away with cheaper models). 80-90% of the time you get what you pay for.