I won't tell you to not bet and do those as you wish, but just keep in mind you threw a very broad challenge that is very easy to skew with little effort. Even using official benchmarks where AMD is just better than nVidia. There's some number crunching things in which AMD is slightly better than nVidia, so I wouldn't be surprised there is a niche, not skewed test, where a 6800(XT) can outperform a 4080.
Anyway, just to talk about your point. Apples to oranges. VRAM capacity is complementary to GPU grunt and nVidia is segmenting accordingly. There's a reason most people on a budget for video production flocked over the 3060 12GB instead of a 3080-class.
Regards.
First off, it's an avatar. So long as they don't ask me to do anything that would get me banned from TH, I don't mind for a month.
Secondly, AMD instead of rolling up their sleeves and actually competing (they threw in the towel a long time ago), they are sitting back and throwing pot shots at nVidia claiming VRAM is the be all and end off of graphics processing. If that was true, we could all run 8086 processors and 15tb of VRAM and it's all good!
I honestly wish AMD would shut up and go release another 9700 on the world and beat nVidia at their own game. Nobody should have to sell their firstborn for a video card, and unfortunately that is the case because nVidia has zero competition.
30 years ago, a high-end consumer level CPU cost $1,000. Today they are less than $700 (not by much, but they are). That is because of the magic of competition.
High end video cards cost $500 about 20 years ago. Today they are 3x as much. nVidia doesn't have any competition, so they can charge whatever they want, and there is nothing you can do about it.
That is what really bothers me about all of this. And it's why I dropped that challenge.