GPU-Z is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is cpufetch, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to GPU-Z and five of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to GPU-Z are The OpenGL Hardware Capability Viewer, V-Ray Benchmark, CheckMyMac and Systempal.
cpufetch is a command-line tool written in C that displays the CPU information in a clean and beautiful way.
Client application for the OpenGL hardware capability database. This tool detects, displays and uploads OpenGL hardware reports to the OpenGL hardware database at http://opengl.gpuinfo.org.
V-Ray Benchmark is a free tool that measures how fast your system renders. Rendering performance evaluation can be done using CPUs, NVIDIA GPUs, or a combination of both.
CheckMyMac monitors key components in your system and helps preventing and discovering major malfunctions before they happen.
SystemPal is becoming an ALL-IN-ONE app. It is the best tool to monitor your memory/CPU usage status, CPU temperature and fan speed, network speed. It also provides a tool kit including mini music player, screen shot utility, memory cleaner.
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Most are CPU related, not GPU related.