Choose a repeatable comparison
Use the same game scene, resolution and settings and record frame time as well as frame rate. Different scenes can stress different components, so one reading cannot classify the whole PC.
Interpret utilisation cautiously
Overall CPU usage can hide a busy core, while frame caps and other limits affect GPU usage. Consider memory, storage and background activity too. A low GPU percentage does not automatically prove the processor needs replacing.
Change one setting at a time
A lower graphics workload can help show how the scene responds, but it is only part of the evidence. Record the result and avoid comparing different game versions or unrelated tests.
Use evidence before buying
Check relevant benchmarks and compatibility for a proposed upgrade. A different bottleneck may appear after a change, and performance gains vary by game. Avoid universal GPU-to-CPU ratios or guaranteed frame-rate improvements.
Questions about this guide
Can one utilisation percentage prove which component is limiting a game?
No. Compare the same scene, settings and frame-rate behaviour and consider limits such as frame caps. Different games and scenes can stress the system differently.
Should I upgrade based on an online bottleneck calculator?
Treat it as a starting point rather than a diagnosis. Measure your own games at your monitor's resolution before choosing a component.