How we test

For each laptop in this month’s Labs, we measure performance using our suite of real-world benchmarks. These test how quickly each system can process a standard set of image and video files, and handle multiple workloads while simultaneously playing high-definition video. The individual scores are combined to an overall score weighted towards multitasking; for an alternative view of single and multicore performance, we also run the Geekbench 5 test suite.

Next, we test 3D performance, again using both real-world and synthetic software. In this case, we run the game Dirt: Showdown on each system at 720p with 4x MSAA and high detail settings, along with the GFXBench Car Chase test, set to off-screen rendering at 1080p.

We test the performance of the internal SSD using the AS SSD benchmarking tool, which determines maximum sequential read and write speeds. We then move onto the screen, using X-Rite colorimeter hardware to establish the maximum brightness the screen is capable of, along with its effective contrast ratio, sRGB coverage and colour accuracy. The latter is expressed as a Delta E figure, with a score of one or below representing perfection as far as the human eye can discern.

Finally, we test each laptop’s battery life by setting the screen to a standard brightness of 170cd/m2, disabling the wireless radio and setting VLC to play a video file in full-screen mode. We then time how long it takes the laptop to go from a fully charged state until the system shuts down. This provides a baseline for comparison between systems, although it goes without saying that heavier workloads and frequent Wi-Fi access will run the battery down more quickly.

The key figures from the above tests are shown in our graphs on p92; in addition, we factor in subjective judgments of design, features and usability, as discussed in our reviews on the following pages, to arrive at a final star rating out of five for each laptop.