I have similar PC specs i7 3770k, 16 GB DDR3 with triple screen 5760x1080 ...and I finally decided to make the jump to the new RTX 2070 coming from a GTX690...and what a difference and massive performance increase I had by just adding the new RTX 2070 had on my old PC system.
I can now run rFactor 2's laser scanned 'Sebring' with 'Full' graphics settings and 15 cars in the Rain and get 99 -149FPS compared to my old GTX690 that was getting only 9-25FPS on low to medium graphics settings....although I did have some problems setting up the new RTX card to start with as there are some issues that needed to be sorted out with the RTX line of cards...might be something to be aware of if you decide to purchase a new nVidia RTX GPU....but all in all I am very happy with the upgrade to the RTX 2070 so far now that the card is running without any issues.
Screen shot below rF2 laser scanned Sebring with MSI Afterburner data...View attachment 279962
Apologies in advance for the slight hijack:
What issues did you have with the RTX cards and what did you do to resolve them? Curious because I have what should be in all respects a faster PC than yours, running a triple monitor setup as well (similar resolution: 5856x1080 for bezel correction)...while it's definitely no slouch, I'm not quite getting those numbers in rF2 and I don't have everything set to full...but then again, I'm pushing it harder in terms of visible cars and total cars on track (20 visible, 40+ cars). Could you possibly take a picture of your graphics settings screen to compare?
My Specs:
i7 8700K (OC'd to 4.8Ghz)
MSI RTX 2080 Gaming X Trio (which I overclocked more using Afterburner's OC Scanner)
16GB DDR4
Mobo: ASUS ROG Maximus X Hero Z370
rF2 running on the boot drive which is a Samsung 970 EVO nvme m.2
Windows 10
I did a run just like you described yours (except my settings aren't on full, see screenshots below) and mine runs at 45 - 65 in the rain. What did you do differently for your RTX?