@Kats over 144 is really nice in pso2... but i wouldn't go to lowest for that... a decent PC should handle this game 144+ max very easily.
It can indeed handle max at 144 but there's two other reasons I go lowest, instantly load into maps (to a fault at times as I load some maps and start bosses before everyone else has finished loading lol).
And also to save my graphics card from overheating as its only got a single working fan, instead of three lol.
Sounds like you need an SSD and liquid cooling, lol.
I do have an SSD. Don't think my loading times would be instant if I didn't haha. As for liquid cooling, would be nice, but for now I just need a new card, due for an upgrade anyway, GTX980Ti lawl.
I've got the same card and about to upgrade soon too [I hope]. Just a tip... I hear the new nvidia rtx 3080s will shoot up in price if you aren't able to get one at launch.