So I recently upgraded from the 7950x to the 9950x (mainly for the better memory controller). And I always had the Razer viper 8khz mouse. To my surprise, after installing the 9950x I booted up Stalker 2. The game was stuttering so bad suddenly. It dipped to 20 FPS from 130 every time I turn so slightly. I tried everything for HOURS until I turned off my mouse software which set it to 1000hz, everything fixed and had NO stutters. Then I realized 8000hz polling rates on mouse will cause major stutters in games. This happened in every game I tested so far.
PLEASE, AMD fix this. This bug NEVER happened with the 7950x cpu, knowing for a fact I always kept it at 8000hz polling rate with that one with no problems. I really don't want to see the 9950x as a downgrade but its starting to seem like it with problems like this.
EDIT: And before you say my mouse software itself is the issue, even with it open and it set to 1000hz everything runs perfectly. So it being a razer software issue is ruled out. The polling rate itself is causing the massive frame drops. I know I'm not the only one with this issue, I saw someone on reddit with a 9800x3D complaining about the same exact problem.