I have encountered a problem playing Forza on my PC where particle effects seem to cause very large pixels. It is worst when it rains, but it also happens on Dubai because of the sand. Similarly tire smoke causes minimal amounts of the same issue. See the attached screen shot from the rain. Any ideas how i can get this to stop? The demo gave me the same issue. I have also updated drivers but to no avail.
Here is my settings
Dynamic Render Quality: Low
Dynamic Settings: Default
Radeon Software Version - 18.3.4
Radeon Software Edition - Adrenalin
Graphics Chipset - AMD Radeon HD 7800 Series
Memory Size - 2048 MB
Memory Type - GDDR5
Core Clock - 1050 MHz
Windows Version - Windows 10 (64 bit)
System Memory - 8 GB
CPU Type - Intel(R) Core™ i5-3570 CPU @ 3.40GHz
Let me know if i can post anything else that will help.