For testing purposes the GPU of any recent Mac is sufficient.
Integrated Intel Graphics or any Metal-compatible GPU
AMD or NVIDIA: Any Metal-compatible GPU
Intel: HD Graphics 4000 and 5000, Iris, UHD Graphics 630
AMD: FirePro D300, D500, D700, Radeon Pro 580X, Radeon Pro W5XXXX, Radeon Pro Vega II or Vega II Duo
Apple silicon GPU
NVIDIA: GeForce GTX 285, GeForce GTX 680 or any Metal-compatible GPU
Once Just Out is started with a display connected to the graphics card, it is not possible to change the resolution or to remove the display anymore. In some cases, even turning the display off can make the outgoing signal corrupt. In such cases you must restart Just Out to resolve the issue.
Even it is technically possible to run the Mac in headless mode, we strongly recommend using a monitor emulator hardware in case that no display is available or planned. Such EDID emulators are available from Gefen and Lindy for example, but a simple HDMI monitor emulator will also do the job.
When using a headless system, it is not possible to change the resolution of the virtual display. Doing so will corrupt the output of Just Out, showing non-moving black blocks randomly spread over the whole output. In this case only a restart of Just Out will resolve the problem.
There are several other GPUs which may also work. Please test thoroughly before using an unlisted graphics card. ToolsOnAir does not offer support services for unlisted graphic cards.
The just:live/just:play user interface (run in Just Control) can be operated on any Mac which supports the minimum system requirements as long as the Just Out engine is running on a hardware listed above.
Some screen-sharing (remote) utilities may change the screen resolution. Please test your solution before going on air.