I tried Asus GPU Tweak (and Afterburner, but prefer Asus UI better). My best score in Borderlands 3 is a bit over 130 fps, which is almost in stock 4090 territory (136 fps).
An entry for the Unreleased category: the Powercolor 5970 Eyefinity 12 with twelve DP ports got a bunch of media chatter in April 2010:
http://www.hardocp.com/news/2010/04/30/powercolor_shows_off_4gb_hd5970_eyefinity_12_card/...
I've been running a 5870 Eyefinity 6 since it came out, I don't run on max, sure, but I also don't need to. I was initially running 5400x1920 in 2010. I got ~60 FPS most games I played and didn't have to overclock my gpu until recently.
It is also incredibly important to not cheap out on slow RAM when aiming for high performance. I really hope DDR5 will bring in a new baseline that DDR4 didn't do at first. DDR4 2400 is still really common to see in some gaming systems.