The 2011 MacBook Air (11 & 13-inch): Thoroughly Reviewed
by Anand Lal Shimpi on July 28, 2011 3:25 AM EST- Posted in
- Apple
- Mac
- Intel
- Sandy Bridge
- MacBook Air
- Laptops
Thermals & Power Consumption
Both the 11 and 13-inch MacBook Air use the same 45W MagSafe power adapter as the 2010 models. 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). I chose two high-load scenarios: Cinebench R11 and Half Life 2 Episode 2. The former is a purely CPU load while the latter is a good mix of CPU and GPU load.
Peak power consumption has gone up significantly since last year. The 11-inch MacBook Air draws 35% more power under full load compared to its 2010 counterpart. In Cinebench R11 however, the new 11 is over twice as fast as the old one. A 35% increase in max power for a 2x increase in performance? I'll take it.
Overall power consumption isn't too bad. You're looking at under 35W for full load on the 11 and around 40W for the 13. Neither exceeds the maximum power draw of a 13-inch MacBook Pro.
How hot are the new Airs on your lap? For the most part they aren't too bad. Under a light load the fan won't spin up and you won't feel more than 31C on your lap:
It's under load that these things can get warm. If you're just measuring surface temperature then the new 11 can hang with the 15-inch MacBook Pro:
The 11-inch MacBook Air actually has it the worst. With a more cramped chassis things seem to get hotter more quickly in there compared to the 13. However max temperature is no where near as bad as the 15-inch MacBook Pro:
Overall the thermals seem to be in line with a 13-inch MacBook Pro, despite being confined to a much smaller chassis.
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GotThumbs - Thursday, July 28, 2011 - link
While Apple has created a pretty cool setup. I feel their breeding a reliance of proprietary devices for Apple users and a market for accessories (similar to IPAD) to gain standard connections provided on other systems. This trend is limiting choices for apples users. I build my own systems and rarely use a laptop. I do have a tablet for light moble use (email, quick web browsing, etc.)I'd be interested to see if Apple uses any of AMD's Llano APU's in future systems. Else there seems to be an exclusivity reminiscent of Dell and Intel in Dells earlier years.
GotThumbs - Thursday, July 28, 2011 - link
Clarification: An Android tablettipoo - Thursday, July 28, 2011 - link
The HD3000 graphics in the MBA aren't the same as the regular, the regular one clocks at 650MHz and turbos up to 1.3GHz and the Low Voltage one 350MHz - 1.2GHz. Since they score similarly in most benchmarks, I wonder if the performance would go down over time as the thermal envelope no longer allows boosting? Likewise for the CPU? Any input on that?futurepastnow - Sunday, July 31, 2011 - link
Most graphics tests (and many games) don't place a heavy load on the CPU at the same time as the GPU, so the GPU can probably use its full turbo as the CPU cores are nearly idle. If both CPU and GPU are both being worked hard, that may change. This is probably reflected in the Starcraft 2 test.As to your second question, it depends on how much extra capacity Apple engineered into the cooling system. Performance should not decrease over time if the fan can adequately cool the processor, even at its highest heat output.
papawapa - Thursday, July 28, 2011 - link
I've been waiting for this review since the launch of the new Air. Thanks Anand! I'm taking a close look at the 13".tipoo - Thursday, July 28, 2011 - link
Yikes, that is a huge drop between the two. Most sites are saying the 13' usually gets the slower controller, which is a bummer because that's what I was considering. How much impact does 4k random read performance have on general feel?tipoo - Thursday, July 28, 2011 - link
You guys have a decibel meter in your lab, right? I'd really like to see idle and load readings for laptop reviews. I think it was there in some of them, but never in a mac article.frumpsnake - Thursday, July 28, 2011 - link
The Airs are listed as Macbook Pros under Clock Speed Scaling Comparison on page 3.TEAMSWITCHER - Thursday, July 28, 2011 - link
"Apple did almost exactly what I asked for and built a monitor with more IO. It's called the Thunderbolt Display and it features an integrated USB 2.0, FireWire 800, Gigabit Ethernet and audio controller."Please tell me your gonna review this monster when it ships. I have been wanting something like this for MacBook Pro since 2007.
bji - Thursday, July 28, 2011 - link
Can you comment on the fan noise? The fan wasn't even mentioned at all in the review except to talk about where its output vent is positioned. I have been spoiled by a fanless laptop for years now and I am really sensitive to annoying fan noise now. I had intended to wait until Ivy Bridge came out in the hopes that it would have reduced thermals and that Apple would make a fanless Macbook based on it. But in the meantime I'd love to know how often the fan spins up on the current Sandy Bridge Macbook Airs and what the volume of it is when it is spinning. Thanks!