To change your graphical performance settings for nTop You may need to use this method if your GPU isn't being selected in nTop
This method will overwrite the NVIDIA settings from Method 2. If pressing Ctrl+H doesn't trigger Precision Render ( What is a Precise Render?), if black images display after rendering, or if you experience any unexpected graphics issues, follow these steps to set the NVIDIA graphics card as the preferred graphics processor.
In that case, you may need to configure a high-performance NVIDIA graphics card to be the default option for nTop. Suppose you are experiencing issues with your computer prioritizing an integrated graphics card.