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The NVIDIA High Definition Audio driver enables the audio output functionality through HDMI or DisplayPort on systems with an NVIDIA graphics card. This driver is essential for transmitting audio signals through the same cable used for video (e.g., HDMI to a monitor or TV) and ensures that you get both high-quality video and sound when using those connections.

How to Install the NVIDIA High Definition Audio Driver:

Automatic Installation (Windows Update):
- Connect the HDMI/DisplayPort Cable: Connect your NVIDIA-powered device to an HDMI or DisplayPort monitor or TV.
- Allow Windows to Detect the Device: When you plug in the cable, Windows will usually detect the new audio device and automatically install the necessary driver.
- Check Device Manager: Go to Device Manager (Windows + X > Device Manager). Under Sound, video and game controllers, you should see "NVIDIA High Definition Audio." If it’s listed without any error icons, the driver is installed.
Manual Installation:
- Visit NVIDIA's Website: Go to the official NVIDIA driver download page and search for the latest driver for your specific GPU model.
- Download the Driver: Select your graphics card model, operating system, and download the latest driver package.
- Install the Driver: Run the downloaded driver file. During the installation, ensure that the audio driver option is selected for installation (this will be part of the graphics driver package).
- Restart the Computer: After installation, reboot your system to ensure the changes take effect.
Check Audio Output:
- After installation, right-click the sound icon in the taskbar and select Playback Devices. You should see "NVIDIA High Definition Audio" as an available playback device. Set it as the default for HDMI or DisplayPort audio output.

Troubleshooting:

If the driver doesn't install automatically, you can try manually updating it through Device Manager by right-clicking on the NVIDIA High Definition Audio device under Sound, video and game controllers and selecting Update Driver.
Make sure your GPU drivers are up to date as well, since the audio driver often comes bundled with the graphics driver package.

This driver allows you to utilize the audio capabilities of your NVIDIA GPU for high-quality sound over HDMI or DisplayPort connections.