With a more cramped chassis things seem to get hotter more quickly in there compared to the 13. The 11-inch MacBook Air actually has it the worst. If you're just measuring surface temperature then the new 11 can hang with the 15-inch MacBook Pro: It's under load that these things can get warm. Under a light load the fan won't spin up and you won't feel more than 31C on your lap: How hot are the new Airs on your lap? For the most part they aren't too bad. Neither exceeds the maximum power draw of a 13-inch MacBook Pro. You're looking at under 35W for full load on the 11 and around 40W for the 13. A 35% increase in max power for a 2x increase in performance? I'll take it. In Cinebench R11 however, the new 11 is over twice as fast as the old one. The 11-inch MacBook Air draws 35% more power under full load compared to its 2010 counterpart. Peak power consumption has gone up significantly since last year. The former is a purely CPU load while the latter is a good mix of CPU and GPU load. I chose two high-load scenarios: Cinebench R11 and Half Life 2 Episode 2. To get an idea of how much power the platform as a whole uses I measured power using the same power brick and a fully charged battery on all three MBA systems (2 new, 1 old). Both the 11 and 13-inch MacBook Air use the same 45W MagSafe power adapter as the 2010 models.
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