Ill have to agree with what most people are saying, one game is not actually an increase in performance.
I own the game and have yet to give it a try, but i can tell you for SURE my performance gain won't be from a BIOS update but rather from the small OC and big ram speed increase i gave my setup.
Here is the 2 ive ran so far and compared to my 4690k (which you can see is still ahead). I even tried my build with high performance power option and balanced. In Grid Autosport (which is old and hasn't even gotten a ryzen patchc and probably won't) we see a nice increase from slight OC (35x to 38x) and ram from 2133 to 2933 (still short of 3200)
i5 4690k/r7 1700x/r7 1700x 3.8ghz, 2933mhz(hp)/balanced
Min 86.98 / 69.90 / 82.35 / 82.733
Avg 111.84 / 95.30 / 107.15 / 107.68
Max 156.24 / 132.85 / 139.34 / 142.75
Far Cry Primal is a different story. Here you can see how a ram increase only increased the min from 55 to 61 (good little bump though) but avg only went up by 2 with 2933 ram compared to 2133 and only 1 more above stock 1700x configuration.
Min 64.00 / 52.00 / 55.00 / 61.00 / 60.00
Avg 73.00 / 69.00 / 70.00 / 72.00 / 71.00
Max 82.00 / 80.00 / 80.00 / 81.00 / 80.00
I have yet to download RTTR again (my hdd died when my first AM4 board died as well, i think just coincidence) so these tests are done on a new HDD as well.