I know a lot of people are saying ~$1000 or more, but my system isn't even close to that and I run the newest STEP (plus even more) at 45-60fps. Mostly 1k textures outside and 2k inside, ENB (only a few things active), SweetFX, ugrids at 7. Â
I built my system myself for less than ~$600, including monitor. I see you aren't actually trying to build one, so I will spare the details. Â ;)
Discussion thread:
PondFish and Salmon Replacer by Nexus79
Wiki Link
I think the designs and textures of the fish in this package are closer to what you would expect in a place like Skyrim. I installed it and it looks excellent in game.
Mod Testing
Link to compares: https://forum.step-project.com/showthread.php?tid=3058&pid=46050#pid46050
Excellent mod. Â I love the fact that it blends so well that I can't tell where vanilla ends and the mod begins. Â Only concern is that BOSS doesn't recognize them. Â I have had no conflicts so far, but it would be nice to have an official load order.