MacOS – How to tell when Turbo Boost is active on the MacBook

I have the same Air as you and I am getting 5-6 hours. So not to much off of what the advertised amount is. Your battery sounds faulty to me.

The last computer I had had a faulty battery. It was replaced for free and within a couple of days. Back then they simply replaced the battery on the MB because it was removable. Chances are now they will give you a new laptop because the battery on the Air is harder to remove. You might be without a computer for a few days though. I don't know what they do in other countries, but in Spain they just took it and mailed it to Holland to get fixed and then mailed it back.

So, I ran some Cinebench R11.5 benchmarks to get more information about the single threaded performance of my i5-3427U¹ (1.8-2.8 GHz) CPU:

1 thread → 1.10

I also contacted the author of the linked article by AnandTech - @anandshimpi². Anand Lal Shimpi was so kind to send me a benchark chart which compared the single threaded performance of the 2011 13" Macbook Airs with the 2012 13" Macbook Airs using Cinebench R11.5.

Into this picture, I have added information about the maximum single threaded CPU clocks along with a comparison of the measured performance such as Anand Lal Shimpi has suggested.

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In this info graphic I am comparing specifically:

• 2011 13" Macbook Air, i5-2557M 1.7GHz/2.4GHz/2.7GHz
• 2012 13" Macbook Air, i5-3427U 1.8GHz/2.6GHz/2.8GHz

As you can see, the single threaded clock of the 2012 model is 3.7% increased in turbo boost mode.

However, the benchmark score saw a 9.9% increase which is not simply due to the higher clock, but also due to the more efficient Ivy Bridge architecture which is about 5-15% faster³ than Sandy Bridge.

In sum, the benchmark scores are as expected whereas the Turbo Ratios log entries are not. Anand Lal Shimpi had "figured it was a bug, submitted it to Apple back in July"⁴.