Hi everyone. Believe me I have done everything you have done. I have finally a solution that works.
I set Affinity on my CPU for both the CODEX pirate version & my paid for version and I get these results. (I did not need to set affinity on this old version, it worked fine, don’t ask me I don’t have an answer)
Min FPS 59.8
Max FPS 60.1
Average FPS 60.0
On My paid for ultimate edition game I get this
Min FPS 51.9
Max FPS 62.6
Average FPS 59.7
Custom ULTRA everything for both.
Here is a link to the screenshots described above. Forza 7 Troubleshooting - Album on Imgur
I did many affinity settings, Use only the physical cores (don’t touch the logical’s) My combo is 0,2,4,6
What did not work for me were 0,1,2,3 - 4,5,6,7 or 1,3,5,7. (0,2,4,6 is like a default standard setting) Also I use AMD 1800x 8/16 Cores -Adjust your affinity appropriately for whatever your CPU is. (UPDATE: I have it also running fine on only logical cores 12,13,14,15)****(UPDATE: If u have an intel CPU disabling core 0 only should work for you)
Seems to work either not good at all on multiple cores or … perfectly over 4 cores.
I hope this helps others. I know the frustration. Oh and affinity does NOT save, you must set it each time. Thanks Turn 10 development team.
(I must add, there is no stutter, nothing at all -this I think was the biggest problem for many people) (EDIT: There is a stutter approximately twice per lap, they are small and does not impact my game to a point that I want to not play, this was the situation before. Some track there are none, its intermittent)
UPDATE: Best settings for me are with core 0,2,8 enabled. Constant 56.1 Min FPS Avg 59.9 Max 61.2. -I tried about 30 variations. If you got Intel, then you should be fine just disabling Core 0.
UPDATE: 0,2,8 (3 cores) on big tracks like Suzuka or COTA causes a short 1-2 seconds freeze 1-2 times per lap -I think the 3 cores are not enough processing power, 0,2,4,6 (4 cores) This problem is gone
UPDATE: I put this together over the weekend. These settings below gave the best results, combinations with results of Min FPS below 50 omitted. Link to the screenshots here → Forza 7 Troubleshooting 2 - Best affinity settings combinations I can find for AMD 1800x - Album on Imgur
0,2,8 Min FPS 56.1 Max FPS 61.2 Avg FPS 59.9
1,2,8 Min FPS 56 Max FPS 62.5 Avg FPS 59.9
0,5,8 Min FPS 55 Max FPS 61.8 Avg FPS 59.6
0,2,6 Min FPS 53.3 Max FPS 63.6 Avg FPS 59.9
0,2,4,6 Min FPS 56 Max FPS 62.3 Avg FPS 59.9
0,2,4,6 then 0,2,8 Min FPS 56.3 Max FPS 59.9
Game was started once, then settings changed after each benchmark.
User post below “FullNietzsche” has the very best results, I have a feeling if I had an Intel CPU I could achieve the same results as FullNietzsche. Worth noting that disabling just Core 0 on AMD has no impact, unlike Intel. A few users with Intel have success with disabling only core 0. Me with AMD requires a working combination as listed above. It is somewhat telling how these two different CPU’s are built to operate. The pattern is easy to see, every so often the game while looking for processing from the CPU the Min FPS is affected.
It can be concluded that the settings for Intel & AMD reduce the stutter aggressiveness substantially and remove approximately 80% of the stutters (This game for me was not playable, now I play it often, it is not perfect, which of cause I would like. I don’t mind playing it now and get a good amount of enjoyment getting around SPA in any car.)
This page has helped a few users of both Intel & AMD, that is the purpose of this page after I found enormous amounts of misinformation & confusion regarding the dreaded “stutter” complaints.
I doubt there will be any further updates, I think I have gone as far as I can with this.