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Ubuntu - GPU - Benchmark your GPU

Technically speaking, all of the available GPU benchmarking tools in Linux only test under the OpenGL renderer of course.

While your GPU may be compatible with some versions of Direct3D, it is not possible to test this renderer under Linux.

GLX-Gears

GLX gears is a popular OpenGL test that is part of the mesa-utils package.

sudo apt install mesa-utils

glxgears

NOTE: This tool is very old, very basic and only tests a small portion of today's OpenGL capabilities.

This will open up a window with an OpenGL rendering of a simple arrangement of three rotating gears.
The frame rate is measured and printed out on the terminal every five seconds.

sudo apt install glmark2

glmark2

NOTE: GL mark is a much richer benchmarking tool developed by the kind people behind the Linaro distribution.

glmark offers a rich set of tests that concern different aspects of your graphics unit performance (buffering, building, lighting, texturing etc), allowing for a much more comprehensive and meaningful test.
Each test is conducted for 10 seconds and the frame rate is counted individually.
In the end, users get a performance score based on all previous tests.