When I bought the sims4 back in 2014 my computer had... a 1080 with an intel 6th gen I think and the game was eventually installed on an SSD. The game ran...fine but never great even with that setup.
It was only when I got my last computer setup that I felt the game ran good but even then I still get framedrops, I got some mods and cc as well and my save has a lot of sims in it so that could be the issue.
My computer setup that I have now is an RTX 3080 (10GB version) with a i912900K installed on an M.2 NVME.
I would say that The Sims 4 performance can be all over the place so I would recommend investing in a computer that you feel happy with and preferably that you also would like to use for other things like playing other games because the sims4 doesn't use all that power very effectively.
I heavily recommend investing in a computer with a NVME as they make all games load very fast.
