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Forza Horizon 5 > 指南 > L.Q.Y-Grass 的指南
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Forza Horizon 5 – RTX 4060 GPU Usage Drop & FPS Fix (Stable Driver Method)
由 L.Q.Y-Grass 制作
Comprehensive fix for RTX 4060 users experiencing sudden GPU usage drops and massive FPS loss after extended play sessions in Forza Horizon 5.

Many players have reported that their GPU usage falls from ~90% down to 10–20% after several minutes or hours of gameplay, with FPS dropping to unplayable levels (10–20 FPS), even though the GPU temperature stays cool (~50°C).

After extensive troubleshooting and driver analysis, this guide provides a confirmed working solution:

Using Display Driver Uninstaller (DDU) to completely remove the NVIDIA driver and reinstall the same stable Game Ready Driver (v552.44 or 551.23) permanently fixes the issue.

The root cause isn’t the game itself, but a corrupted internal driver state in NVIDIA’s DX12 and NVPM modules, which mismanages GPU scheduling and power profiles over time.

This guide explains:

How to properly clean-reinstall your GPU driver

Which folders to clear for Shader Cache

Why this issue happens at the driver-level (DX12, NVPM, DXGI)

Extra preventive tips to keep FH5 running smoothly on RTX 40-series cards

Technical insight is provided so you understand why this fix works — not just how to apply it.

Tested on:

．RTX 4060 8GB + Ryzen 7 5700
．32GB RAM
．2560×1440 resolution

Works flawlessly for long sessions (5–6 hours continuous play) with stable GPU usage (85–98%) and consistent FPS (90–110).
   
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L.Q.Y-Grass
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类型: 攻略
发表于
10 月 12 日 上午 2:12
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指南索引
总览
Issue Description 
Root Cause 
Solution Steps 
Technical Explanation 
Additional Recommendations 
Tested System Setup 
Conclusion 
留言
Issue Description
When starting the game, GPU usage is around 90% and FPS is normal (90–110 FPS).
However, after 10 minutes to several hours of gameplay, the following happens:

．GPU usage drops to 10–20%
．FPS drops to 10–20 FPS
．GPU temperature remains low (around 50°C, no thermal throttling)
．CPU usage remains normal

Lowering graphics settings or clearing the Shader Cache does not help.
Restarting the game temporarily fixes it, but the issue always comes back.
Root Cause
This is not a simple game or temperature issue.
The real cause is an internal driver-level malfunction in the NVIDIA stack:

“NVIDIA driver (DX12 and NVPM modules) entered an incorrect internal state or cache corruption.”

Possible technical causes include:

1.Corrupted driver game profile (nvdrsdb) → incorrect power load detection
2.Broken Shader Cache or Pipeline State Object → DX12 resource misallocation
3.NVPM power management mislearning → driver wrongly assumes GPU is idle and downclocks
4.DXGI memory descriptor table corruption → resource release failure causes GPU scheduler idle
Solution Steps
1. Use DDU to completely remove the GPU driver

　　．Download Display Driver Uninstaller (DDU)

　　．Boot into Windows Safe Mode → remove all NVIDIA drivers

2. Reinstall a stable Game Ready Driver

　　．Recommended versions: 552.44 or 551.23

　　．During installation, select “Clean Installation”

3. (Optional) Clear Shader Cache manually

　　．Delete all contents in these folders:

%LocalAppData%\NVIDIA\DXCache
%LocalAppData%\NVIDIA\GLCache
%LocalAppData%\D3DSCache
%AppData%\NVIDIA\ComputeCache

Also clear :
Windows Settings → System → Storage → Temporary Files → DirectX Shader Cache

4. Reboot your system and test again
　　．Launch Forza Horizon 5
　　．Verify GPU usage remains 80–100% and FPS no longer degrades
Technical Explanation
Reinstalling the same driver version fixes the problem because it:

　　．Rebuilds corrupted game profiles and shader pipeline structures

　　．Resets the NVPM (NVIDIA Power Management) learning table

　　．Clears broken DX12 / DXGI internal memory allocations

In short:

Reinstalling the driver resets faulty low-level driver states, restoring normal GPU frequency and scheduling behavior.
Additional Recommendations
Regularly clear Shader Cache (every 1–2 weeks)

Disable Windows Fast Startup to prevent state retention

If the issue still occurs after long sessions, try:

　　．Launching with DX11: -dx11

　　．Disabling Ray Tracing and DLSS

　　．Restarting the game every few hours to release DX12 resources
Tested System Setup
GPU: RTX 4060 8GB

CPU: Ryzen 7 5700

Motherboard: Gigabyte B550M AORUS ELITE

RAM: 32 GB

Resolution: 2560×1440 (1440p)
Conclusion
If you’re using an RTX 40-series GPU and experience massive GPU usage drops and FPS degradation in Forza Horizon 5 after extended play sessions,
try removing your driver with DDU and then reinstalling the exact same stable version (e.g., 552.44).

This is not a version bug, but a driver-state corruption issue at the power management and DX12 resource level.
1 条留言
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yimig 12 月 12 日 上午 8:06 
加油，喵喵喵！