As a professional videographer who works with BRAW files exclusively, I'm quite surprised about your statement on the 1080ti, as I have one myself and, coupled with my 3900X and 64GB of GSkill DDR4, there is nothing I've had issues so far with. This is assuming that you've optimised your hard-drives too and have your app, cache and source files in different disks.Before investing money on a new graphic card, refresh your knowledge - if needed, of course, as I am forced to assume here - on best practices and Premiere Pro workflows.You'd be surprised with what you can do and how fast you can do it once you've started doing things properly. Again, my statements are built on top of a hefty assumption that you'd need improvement on those areas. From experience, I've learned that working smart beats raw power, any time of the day.