Nice new machine!
Just curious - I assume you used the 3090 with the i7 7700K. What games out there made it struggle noticeably enough to warrant a whole new system? I'm using a 7700K as well, with a 2080ti and playing at 1440p. So far I have yet to encounter any games that don't run buttery smooth on Ultra settings. I don't keep track of actual fps that much. As long as it "feels" smooth, that's all I care about. I don't think I could tell the difference between 100fps and 120fps TBH.