Refresh Rates: Higher refresh rates (above 60 Hz) might run into bottlenecks.

Performance: 3D performance may be slower than Nvidia proprietary drivers.

Nouveau users should be aware of the following limitations: The Nouveau project is actively supported by the open-source community. Nouveau is used as the default Nvidia device driver for Linux distributions like Fedora, Ubuntu, Debian, and OpenSUSE. But since 2008, Gallium3D is being used for 3D support.

The initial versions of Nouveau were using Direct Rendering Infrastructure (DRI) for Mesa 3D for 3D graphics functionalities. In 2010, Nouveau was accepted into the Linux kernel as an experimental device driver. The first official release was demonstrated in the in 2007. In 2005, Nouveau started as nv driver patches. The predecessor of Nouveau is the deprecated 2D-only open-source nv driver. Nouveau is freely distributed under the MIT License. The project is currently managed by X.Org Foundation. Nouveau is based on Nvidia’s proprietary Linux driver.

The device driver was developed with the cooperation of Nvidia engineers but it’s not the official Nvidia driver. Nouveau is the open-source device driver to support Nvidia graphics cards and the Nvidia Tegra family of SoCs. The proprietary driver supports more Nvidia cards than Nouveau. You can use Nvidia cards with the open-source Nouveau device driver or the Nvidia proprietary drivers.

How to install nvidia drivers on debian