What should you check?
Start with your monitor resolution, the games or applications you actually use and the frame rate or workload you expect. Then compare specific models.
How should you test it?
Check VRAM, performance in relevant workloads, power draw, card length and required power connectors.
How should you read the result?
More VRAM does not automatically make a GPU faster, but too little memory can limit high-resolution textures and heavier creative projects. The whole GPU matters.
What should you do next?
Before buying, make sure the power supply has enough capacity and the right cables, and that the case has enough clearance and airflow.

Frequently asked questions
Do I need to install anything?
No. The guide and compatible ACC64 tests run in your browser.
Does one bad result always mean broken hardware?
Not always. Repeat the test, check the connection and settings, and if possible compare the result on another computer.