[Question] How to disable RTX 5080 (fans stop spinning) under macOS?

[unclesam]

Hello everyone,
Here’s my current setup:

• Motherboard: Dual PCIe x16 slots (TUF GAMING B850-PLUS WIFI)
• GPUs: NVIDIA RTX 5080 + AMD RX560
• CPU: AMD Ryzen 9 9900X
• Bootloader: OpenCore

When booting into macOS via OpenCore, I’d like to completely disable the RTX 5080 — ideally with the fans stopped and power turned off — and use only the RX560 for display output.
The main reason is to reduce power consumption and fan noise while working in macOS, since I only need the RTX 5080 for AI workloads and gaming under Windows.


Is it possible to achieve this setup safely on macOS?
Any method or suggestion would be greatly appreciated.

 

[Edhawk]

The best solution is to use a custom SSDT to disable the dGPU.

Disabling desktops unsupported GPUs(SSDT-GPU-DISABLE) | Getting Started With ACPI

 

[unclesam]

@Edhawk Okay, I’m going to start working on it. Thanks!