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. I also contacted the author of the linked article by AnandTech - 2. So, I ran some Cinebench R11.5 benchmarks to get more information about the single threaded performance of my i5-3427U 1 (1.8-2.8 GHz) CPU: No matter how I stress my CPU, it always calculates that the clock is at a constant 2.3 GHz. The current version 2.1 has been released on the but still seems buggy. MacCPUID 4 is an official tool by Intel which you can use to calculate the current CPU clock. I wish I were able to use the MSR tools to get more information about the clock speeds, but for them to work I need to boot in 32-bit kernel mode which is not available in Mountain Lion anymore. This raises the obvious question: Why is my Mac's CPU throttled? This would be in line with Apple's advertisement 3 for the 2012 13" Macbook Air: However, according to 2 the Turbo Ratio should be 008A or 1.8GHz/2.6GHz/2.8GHz. (Edited text from AnandTech to fit my CPU.) Five bins is 500MHz, which on top of the 1.8GHz base The fourth number gives us max turbo when only a single core isĪctive: 5. That's 3 bins, whereĮach bin is 100MHz, or 300MHz above the stock 1.8GHz operating Maximum turbo boost with two cores active: 3. Two cores and thus doesn't support any turbo ratios when 4 or 3 coresĪre active (2012 Macbook Air, i5-3427U). The first two numbers are 0s because the CPU doesn't have more than Depending on the active cores, the clock speed The four digit number is the turbo ratio for the active cores The line above lists turbo ratios as 0035. What you'll find is something like this: Dec 16 20:11:47 localhost kernel: AppleIntelCPUPowerManagement: Turbo Ratios 0035 Search for entries containing Turbo Ratios.Open /Applications/Utilities/Console.app.In Mountain Lion you can do this the following way: Since they are logged, the information is very easy to find. AnandTech has a instructions 1 on how you can check the Turbo Ratios for the Mac's CPU.
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