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MacBook Air: Silent, Cool, But Throttles Under Load
26 Jul
Summary
- Newer MacBook Air models use passive heat spreaders, eliminating fan noise.
- Fanless design improves battery life and reduces weight in MacBook Air.
- Thermal throttling can reduce performance under heavy loads on fanless models.
Recent MacBook Air iterations, including models with the M5 chip, now feature passive heat spreaders instead of active cooling fans. This innovative design leverages the aluminum casing to dissipate heat, allowing for completely silent operation during everyday tasks. The elimination of fans has also resulted in a lighter overall device, with the MacBook Air M2 weighing slightly less than its predecessor.
Furthermore, removing fans has contributed to a marginal increase in battery life for these models. Despite these advantages, the fanless design introduces a significant drawback: thermal throttling. When the processor is under heavy load, macOS may intentionally slow down speeds to prevent overheating.
This reduction in performance can manifest as longer processing times for tasks like video exports or a noticeable decrease in frame rates during gaming. Additionally, fanless MacBook Air models can feel warmer to the touch on their underside during intensive use compared to older, fan-cooled versions.
