Benchmarks explained: what the numbers in reviews really mean
Benchmark scores look precise, but they only measure what they test. How to read them without being misled.
Reviews of phones, laptops and graphics cards are full of benchmark scores. They are useful — but only if you know what they measure.
What a benchmark is
A benchmark is a repeatable test that runs the same workload on different devices so their results can be compared. Some are synthetic — designed specifically to stress a component — while others time real tasks such as exporting a video or loading a game.
Types you will see
- CPU tests measure processing speed, often with separate single-core and multi-core scores. Single-core affects how snappy apps feel; multi-core matters for heavy work like video export.
- GPU tests measure graphics performance, usually for gaming.
- Storage tests measure how fast data is read and written.
- Battery tests loop a task — web browsing or video — until the battery runs out.
- Game tests report frames per second at specific settings and resolutions.
How to read them sensibly
- Compare like with like. Scores from different benchmark versions or settings can't be compared.
- Look at the gap, not the ranking. A 5% difference is rarely noticeable; 50% usually is.
- Sustained vs peak. Thin devices can score highly for a minute, then slow down as they heat up. Good reviews run tests repeatedly to show this.
- Real tasks beat synthetic ones for deciding what to buy.
What benchmarks miss
Screen quality, keyboard feel, camera processing, software updates and build quality don't appear in a score — yet they often matter more in daily use.
The bottom line
Use benchmarks to understand how much faster one device is at a specific job. Then decide whether that job is one you actually do.